Duncan P. N. Exon Smith 69feac12d0 Lex: Avoid MemoryBuffer* key in ExcludedPreprocessorDirectiveSkipMapping, NFC ...

This is a prep patch for changing SourceManager to return
`Optional<MemoryBufferRef>` instead of `MemoryBuffer`. With that change the
address of the MemoryBuffer will be gone, so instead use the start of the
buffer as the key for this map.

No functionality change intended, as it's expected that the pointer identity
matches between the buffers and the buffer data.

Radar-Id: rdar://70139990
Differential Revision: https://reviews.llvm.org/D89136

2020-10-12 17:39:01 -04:00

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