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[clang-tidy][NFC] Tweak GlobList to iterate backwards

Authored by njames93 on Nov 10 2020, 6:27 AM.

Description

[clang-tidy][NFC] Tweak GlobList to iterate backwards

By iterating backwards over the globs we can exit the loop as soon as we find a match.

While we're here:

  • Regex doesn't need to be mutable.
  • We can reserve the amount of Globs needed ahead of time.
  • Using a SmallVector with size 0 is slightly more space efficient than a std::vector.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D91033