[PATCH] [Modules] Teach Clang to survive ambiguous macros which come from system headers even if they arrived when merging non-system modules.

[Chandler Carruth]

I should have mentioned, I'll simplify the test case to something more precise prior to committing now that I know what the nature of the bug is.

I'm mostly interested in whether you agree with my reasoning about the fix.


http://reviews.llvm.org/D8310

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