Doug Gregor 8871129896 [Macros] Add frontend flag to dump macro expansions for diagnostics. ...

Add frontend flag `-emit-macro-expansion-files diagnostics` to emit any
macro expansion buffers referenced by diagnostics into files in a
temporary directory. This makes debugging type-checking failures in
macro expansions far easier, because you can see them after the
compiler process has exited.

2023-01-30 18:05:53 -08:00

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