[PATCH] D89503: SourceManager: Factor out helpers for common SLocEntry lookup pattern, NFC

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith created this revision.
dexonsmith added a reviewer: arphaman.
Herald added a subscriber: ributzka.
dexonsmith requested review of this revision.

Add helpers `getSLocEntryOrNull`, which handles the `Invalid` logic around `getSLocEntry`, and `getSLocEntryForFile`, which also checks for `SLocEntry::isFile`, and use them to reduce repeated code.


https://reviews.llvm.org/D89503

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

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