Duncan P. N. Exon Smith dcc4f7f3c4 ARCMigrate: Stop abusing PreprocessorOptions for passing back file remappings, NFC ...

As part of reducing use of PreprocessorOptions::RemappedFileBuffers,
stop abusing it to pass information around remapped files in
`ARCMigrate`.  This simplifies an eventual follow-up to switch to using
an `InMemoryFileSystem` for this.

Differential Revision: https://reviews.llvm.org/D90887

2020-12-02 16:28:33 -08:00

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