branchmap: pass changelog into branchmap functions As part of building the branchmap, we loop over revs and call branchmap() or _branchmap(). Previously, these functions were accessing repo.changelog. We know from past experience that repo.changelog in loops is bad for performance. This commit teaches the branchmap code to pass a changelog instance into branchmap() and _branchmap() so we don't need to pay this penalty. On my MBP, this appears to show a speedup on a clone of the mozilla-unified repo: $ hg perfbranchmap --clear-revbranch ! base ! wall 21.078160 comb 21.070000 user 20.920000 sys 0.150000 (best of 3) ! wall 20.574682 comb 20.560000 user 20.400000 sys 0.160000 (best of 3) $ hg perfbranchmap ! base ! wall 4.880413 comb 4.870000 user 4.860000 sys 0.010000 (best of 3) ! wall 4.573968 comb 4.560000 user 4.550000 sys 0.010000 (best of 3) Differential Revision: https://phab.mercurial-scm.org/D5161

fuzz: move many initialization steps into LLVMFuzzerInitialize Doing this means that things we intentionally leak (eg type objects) no longer confuse AddressSanitizer, so now we can run the fuzzer MUCH longer. Differential Revision: https://phab.mercurial-scm.org/D5154

bundle2: fix broken compression engine assertion bundletype() is a function, so it needs to be called, and it is documented to return a 2-tuple. This code is untested, so that's why we haven't noticed the bad assertion. Differential Revision: https://phab.mercurial-scm.org/D5155