[PATCH] D28218: Small optimizations for SourceManager::getFileID()

[Daniel Jasper via Phabricator via cfe-commits]

djasper created this revision.
djasper added a reviewer: rsmith.
djasper added a subscriber: cfe-commits.

Specifically:

- Separate one-entry cache for loaded and local files
- Use bound that can be deduced from that cache for LessIndex
- Address FIXME to use a faster alternative to isOffsetInFileID()

No functional changes intended.


https://reviews.llvm.org/D28218

Files:
  include/clang/Basic/SourceManager.h
  lib/Basic/SourceManager.cpp

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