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.
1:016807e6fdaf
0:eb43f19ff115
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1 files updated, 0 files merged, 0 files removed, 0 files unresolved
eb43f19ff115
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reverting file1
? file1.orig
eb43f19ff115
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
? file1.orig
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1 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
? file1.orig
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? file1.orig
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? file1.orig
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0 files updated, 0 files merged, 0 files removed, 0 files unresolved
? file1.orig
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