[PATCH] D89427: clang/Frontend: Use MemoryBufferRef in FrontendInputFile (and remove SourceManager::getBuffer)

[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.

In order to drop the final callers to `SourceManager::getBuffer`, change
`FrontendInputFile` to use `Optional<MemoryBufferRef>`. Also updated
the "unowned" version of `SourceManager::createFileID` to take a
`MemoryBufferRef` (it now calls `MemoryBuffer::getMemBuffer`, which
creates a `MemoryBuffer` that does not own the buffer data).


https://reviews.llvm.org/D89427

Files:
  clang/include/clang/Basic/SourceManager.h
  clang/include/clang/Frontend/FrontendAction.h
  clang/include/clang/Frontend/FrontendOptions.h
  clang/lib/Basic/SourceManager.cpp
  clang/lib/Format/MacroExpander.cpp
  clang/lib/Frontend/ASTUnit.cpp
  clang/lib/Frontend/CompilerInstance.cpp
  clang/lib/Frontend/FrontendAction.cpp
  clang/lib/Frontend/FrontendActions.cpp
  clang/unittests/Format/TestLexer.h

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