clang/Basic: Replace SourceManager::getMemoryBufferForFile, NFC
Replace `SourceManager::getMemoryBufferForFile`, which returned a dereferenceable `MemoryBuffer*` and had a `bool*Invalid` out parameter, with `getMemoryBufferForFileOrNone` (returning `Optional<MemoryBufferRef>`) and `getMemoryBufferForFileOrFake` (returning `MemoryBufferRef`). Differential Revision: https://reviews.llvm.org/D89429
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