perf: add option to perfstatus to get the status of unknown files
When status needs to look at unknown files (e.g. when running hg status), it
needs to use a completely different algorithm than when it doesn't (e.g. when
running hg diff).
dirstate: test normalize is truthy instead of using a no-op lambda
hg perfstatus -u on a working directory with 170,000 files, without this
change:
! wall 1.869404 comb 1.850000 user 1.170000 sys 0.680000 (best of 6)
With this change:
! wall 1.839561 comb 1.830000 user 1.120000 sys 0.710000 (best of 6)
tests: don't hardcode errno==2 for ENOENT
Hurd seems to set ENOENT to 2 + 2**30, unlike everyone else.
osutil: write a C implementation of statfiles for unix
This makes a big difference to performance.
In a clean working directory containing 170,000 files, performance of
"hg --time diff" improves from 2.38 seconds to 1.69.
i18n-ja: synchronized with
f94ead934067