[PATCH] D90067: SourceManager: Return non-const references in getOrCreateContentCache and related, NFC

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

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

Update a few APIs to return non-const references instead of pointers,
and remove associated `const_cast`s and non-null assertions.


https://reviews.llvm.org/D90067

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

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