util._matcher: speed up regexp matching.
In 4babaa52badf, Benoit made a change that substantially slows matching
when a big .hgignore file is in play, because it calls into the regexp
matching engine potentially hundreds of times per file to be matched.
I've partly rolled back his change, so that we only call into the matcher
once per file, but preserved the ability to report a meaningful error
message if there's a syntax error in the regexp.
adding a/a
adding a/b
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
copying a/a to b/a
copying a/b to b/b
removing a/a
removing a/b
2 files updated, 0 files merged, 2 files removed, 0 files unresolved
resolving manifests
overwrite None partial False
ancestor f9b20c0d4c51 local ce36d17b18fb+ remote 55119e611c80
a/c: remote renamed directory to b/c -> d
a/a: remote moved to b/a -> m
a/b: remote moved to b/b -> m
copying a/a to b/a
removing a/a
copying a/b to b/b
removing a/b
moving a/c to b/c
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
a/* b/a b/b b/c
M b/a
a/a
M b/b
a/b
A b/c
a/c
R a/a
R a/b
R a/c
2 files updated, 0 files merged, 1 files removed, 0 files unresolved
resolving manifests
overwrite None partial False
ancestor f9b20c0d4c51 local 55119e611c80+ remote ce36d17b18fb
b/a: local moved to a/a -> m
b/b: local moved to a/b -> m
None: local renamed directory to b/c -> d
getting a/c to b/c
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
a/* b/a b/b b/c
M b/a
a/a
M b/b
a/b
A b/c
a/c