Jordan Rose 5edbefcc69 [ClangImporter] Break circularity when importing macros (#13099) ...

Rather than being smart about this, just record an import failure when
we start importing a particular macro and update it at the end. Also
add a PrettyStackTrace to make this a little easier to track down in
the future.

The old logic for importing macros that just aliased other macros
managed to handle this in a clever way, but that was never tested for
the newer logic that evaluates expressions (fa834e2f80). Macro
importing in general probably deserves some cleanup, but meanwhile we
should make sure not to crash!

rdar://problem/34986930

2017-12-01 11:42:49 -08:00

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