copies: use the rust code for `combine_changeset_copies`

copies: use the rust code for `combine_changeset_copies`

Changeset centric copy tracing now use the rust code. The rust code focussed on
simplicity and will be optimised later. So the performance is not great yet. Now
that all the pieces are in place we can start working on performance in the
coming changesets.

Below is a table that summarize how slower we got:

Repo            Cases                                 Source-Rev   Dest-Rev         Py-time       Rust-time    Difference   Factor
------------------------------------------------------------------------------------------------------------------------------------
mercurial       x_revs_x_added_0_copies               ad6b123de1c7 39cfcef4f463 :   0.000049 s,   0.000046 s,  -0.000003 s, × 0.9388
mercurial       x_revs_x_added_x_copies               2b1c78674230 0c1d10351869 :   0.000112 s,   0.000173 s,  +0.000061 s, × 1.5446
mercurial       x000_revs_x000_added_x_copies         81f8ff2a9bf2 dd3267698d84 :   0.004216 s,   0.006303 s,  +0.002087 s, × 1.4950
pypy            x_revs_x_added_0_copies               aed021ee8ae8 099ed31b181b :   0.000204 s,   0.000229 s,  +0.000025 s, × 1.1225
pypy            x_revs_x000_added_0_copies            4aa4e1f8e19a 359343b9ac0e :   0.000058 s,   0.000056 s,  -0.000002 s, × 0.9655
pypy            x_revs_x_added_x_copies               ac52eb7bbbb0 72e022663155 :   0.000112 s,   0.000143 s,  +0.000031 s, × 1.2768
pypy            x_revs_x00_added_x_copies             c3b14617fbd7 ace7255d9a26 :   0.000339 s,   0.001166 s,  +0.000827 s, × 3.4395
pypy            x_revs_x000_added_x000_copies         df6f7a526b60 a83dc6a2d56f :   0.010214 s,   0.022931 s,  +0.012717 s, × 2.2451
pypy            x000_revs_xx00_added_0_copies         89a76aede314 2f22446ff07e :   0.047497 s,   0.852446 s,  +0.804949 s, × 17.9474
pypy            x000_revs_x000_added_x_copies         8a3b5bfd266e 2c68e87c3efe :   0.075297 s,   2.221824 s,  +2.146527 s, × 29.5075
pypy            x000_revs_x000_added_x000_copies      89a76aede314 7b3dda341c84 :   0.057322 s,   1.194162 s,  +1.136840 s, × 20.8325
pypy            x0000_revs_x_added_0_copies           d1defd0dc478 c9cb1334cc78 :   0.796264 s,  62.468362 s, +61.672098 s, × 78.4518
pypy            x0000_revs_xx000_added_0_copies       bf2c629d0071 4ffed77c095c :   0.020491 s,   0.022116 s,  +0.001625 s, × 1.0793
pypy            x0000_revs_xx000_added_x000_copies    08ea3258278e d9fa043f30c0 :   0.121612 s,   2.972788 s,  +2.851176 s, × 24.4449
netbeans        x_revs_x_added_0_copies               fb0955ffcbcd a01e9239f9e7 :   0.000143 s,   0.000180 s,  +0.000037 s, × 1.2587
netbeans        x_revs_x000_added_0_copies            6f360122949f 20eb231cc7d0 :   0.000112 s,   0.000123 s,  +0.000011 s, × 1.0982
netbeans        x_revs_x_added_x_copies               1ada3faf6fb6 5a39d12eecf4 :   0.000232 s,   0.000315 s,  +0.000083 s, × 1.3578
netbeans        x_revs_x00_added_x_copies             35be93ba1e2c 9eec5e90c05f :   0.000721 s,   0.001297 s,  +0.000576 s, × 1.7989
netbeans        x000_revs_xx00_added_0_copies         eac3045b4fdd 51d4ae7f1290 :   0.010115 s,   0.024884 s,  +0.014769 s, × 2.4601
netbeans        x000_revs_x000_added_x_copies         e2063d266acd 6081d72689dc :   0.015461 s,   0.032653 s,  +0.017192 s, × 2.1120
netbeans        x000_revs_x000_added_x000_copies      ff453e9fee32 411350406ec2 :   0.060756 s,   4.230118 s,  +4.169362 s, × 69.6247
netbeans        x0000_revs_xx000_added_x000_copies    588c2d1ced70 1aad62e59ddd :   0.605842 s, killed
mozilla-central x_revs_x_added_0_copies               3697f962bb7b 7015fcdd43a2 :   0.000164 s,   0.000197 s,  +0.000033 s, × 1.2012
mozilla-central x_revs_x000_added_0_copies            dd390860c6c9 40d0c5bed75d :   0.000331 s,   0.000622 s,  +0.000291 s, × 1.8792
mozilla-central x_revs_x_added_x_copies               8d198483ae3b 14207ffc2b2f :   0.000249 s,   0.000296 s,  +0.000047 s, × 1.1888
mozilla-central x_revs_x00_added_x_copies             98cbc58cc6bc 446a150332c3 :   0.000711 s,   0.001626 s,  +0.000915 s, × 2.2869
mozilla-central x_revs_x000_added_x000_copies         3c684b4b8f68 0a5e72d1b479 :   0.003438 s,   0.006218 s,  +0.002780 s, × 1.8086
mozilla-central x_revs_x0000_added_x0000_copies       effb563bb7e5 c07a39dc4e80 :   0.069869 s,   0.132760 s,  +0.062891 s, × 1.9001
mozilla-central x000_revs_xx00_added_0_copies         6100d773079a 04a55431795e :   0.005701 s,   0.029001 s,  +0.023300 s, × 5.0870
mozilla-central x000_revs_x000_added_x_copies         9f17a6fc04f9 2d37b966abed :   0.005757 s,   0.005886 s,  +0.000129 s, × 1.0224
mozilla-central x000_revs_x000_added_x000_copies      7c97034feb78 4407bd0c6330 :   0.061826 s,   3.619850 s,  +3.558024 s, × 58.5490
mozilla-central x0000_revs_xx000_added_0_copies       9eec5917337d 67118cc6dcad :   0.043354 s,   0.058678 s,  +0.015324 s, × 1.3535
mozilla-central x0000_revs_xx000_added_x000_copies    f78c615a656c 96a38b690156 :   0.198979 s,  11.926587 s, +11.727608 s, × 59.9389
mozilla-central x00000_revs_x0000_added_x0000_copies  6832ae71433c 4c222a1d9a00 :   2.067096 s, killed
mozilla-central x00000_revs_x00000_added_x000_copies  76caed42cf7c 1daa622bbe42 :   3.102616 s, killed
mozilla-try     x_revs_x_added_0_copies               aaf6dde0deb8 9790f499805a :   0.001212 s,   0.001204 s,  -0.000008 s, × 0.9934
mozilla-try     x_revs_x000_added_0_copies            d8d0222927b4 5bb8ce8c7450 :   0.001237 s,   0.001217 s,  -0.000020 s, × 0.9838
mozilla-try     x_revs_x_added_x_copies               092fcca11bdb 936255a0384a :   0.000557 s,   0.000605 s,  +0.000048 s, × 1.0862
mozilla-try     x_revs_x00_added_x_copies             b53d2fadbdb5 017afae788ec :   0.001532 s,   0.001876 s,  +0.000344 s, × 1.2245
mozilla-try     x_revs_x000_added_x000_copies         20408ad61ce5 6f0ee96e21ad :   0.035166 s,   0.078190 s,  +0.043024 s, × 2.2235
mozilla-try     x_revs_x0000_added_x0000_copies       effb563bb7e5 c07a39dc4e80 :   0.070336 s,   0.135428 s,  +0.065092 s, × 1.9254
mozilla-try     x000_revs_xx00_added_0_copies         6100d773079a 04a55431795e :   0.006080 s,   0.029123 s,  +0.023043 s, × 4.7900
mozilla-try     x000_revs_x000_added_x_copies         9f17a6fc04f9 2d37b966abed :   0.006099 s,   0.006141 s,  +0.000042 s, × 1.0069
mozilla-try     x000_revs_x000_added_x000_copies      1346fd0130e4 4c65cbdabc1f :   0.064317 s,   4.857827 s,  +4.793510 s, × 75.5294
mozilla-try     x0000_revs_x_added_0_copies           63519bfd42ee a36a2a865d92 :   0.303263 s,  10.674920 s, +10.371657 s, × 35.2002
mozilla-try     x0000_revs_x_added_x_copies           9fe69ff0762d bcabf2a78927 :   0.292804 s,   9.789462 s,  +9.496658 s, × 33.4335
mozilla-try     x0000_revs_xx000_added_x_copies       156f6e2674f2 4d0f2c178e66 :   0.107594 s,   1.087890 s,  +0.980296 s, × 10.1111
mozilla-try     x0000_revs_xx000_added_0_copies       9eec5917337d 67118cc6dcad :   0.045202 s,   0.060556 s,  +0.015354 s, × 1.3397
mozilla-try     x0000_revs_xx000_added_x000_copies    89294cd501d9 7ccb2fc7ccb5 :   1.926277 s, killed
mozilla-try     x0000_revs_x0000_added_x0000_copies   e928c65095ed e951f4ad123a :   0.794492 s, killed
mozilla-try     x00000_revs_x_added_0_copies          6a320851d377 1ebb79acd503 :  84.521497 s, killed
mozilla-try     x00000_revs_x00000_added_0_copies     dc8a3ca7010e d16fde900c9c :   0.965937 s,  19.647038 s, +18.681101 s, × 20.3399
mozilla-try     x00000_revs_x_added_x_copies          5173c4b6f97c 95d83ee7242d :  83.367146 s, killed
mozilla-try     x00000_revs_x000_added_x_copies       9126823d0e9c ca82787bb23c :  84.260895 s, killed
mozilla-try     x00000_revs_x0000_added_x0000_copies  8d3fafa80d4b eb884023b810 :   3.274537 s, killed
mozilla-try     x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d :  42.235843 s, killed
mozilla-try     x00000_revs_x00000_added_x000_copies  9b2a99adc05e 8e29777b48e6 :  49.872829 s, killed

Differential Revision: https://phab.mercurial-scm.org/D9299

--- a/mercurial/copies.py	Wed Sep 18 13:21:38 2019 +0200
+++ b/mercurial/copies.py	Thu Oct 01 18:52:13 2020 +0200
@@ -17,6 +17,7 @@
     match as matchmod,
     node,
     pathutil,
+    policy,
     pycompat,
     util,
 )
@@ -26,6 +27,8 @@
 
 from .revlogutils import flagutil
 
+rustmod = policy.importrust("copy_tracing")
+
 
 def _filter(src, dst, t):
     """filters out invalid copies after chaining"""
@@ -310,8 +313,15 @@
 
     It returns the aggregated copies information for `targetrev`.
     """
+
+    alwaysmatch = match.always()
+
+    if rustmod is not None and alwaysmatch:
+        return rustmod.combine_changeset_copies(
+            list(revs), children, targetrev, revinfo, isancestor
+        )
+
     all_copies = {}
-    alwaysmatch = match.always()
     for r in revs:
         copies = all_copies.pop(r, None)
         if copies is None: