Duncan P. N. Exon Smith af4fb416bd clang/StaticAnalyzer: Stop using SourceManager::getBuffer ...

Update clang/lib/StaticAnalyzer to stop relying on a `MemoryBuffer*`,
using the `MemoryBufferRef` from `getBufferOrNone` or the
`Optional<MemoryBufferRef>` from `getBufferOrFake`, depending on whether
there's logic for checking validity of the buffer. The change to
clang/lib/StaticAnalyzer/Core/IssueHash.cpp is potentially a
functionality change, since the logic was wrong (it checked for
`nullptr`, which was never returned by the old API), but if that was
reachable the new behaviour should be better.

Differential Revision: https://reviews.llvm.org/D89414

2020-10-15 00:34:24 -04:00

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