[PATCH] isCharInSet refactoring.

[Alexander Kornienko]

The problem I was most concerned about in the previous implementation, is
its usage of a mutex on each call, which led to performance problems when
used in clang-format via columnWidth in assertions-enabled build.
On Aug 28, 2013 5:50 PM, "Jordan Rose" <jordan_rose at apple.com> wrote:

>
>   Besides eliminating the custom binary search, I'm not sure this is a
> significant improvement, but I don't have any more objections. Manuel?
>
> http://llvm-reviews.chandlerc.com/D1534
>
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