[PATCH] Implement diagnostic mode for -fsanitize=cfi*, -fsanitize=cfi-diag.

[Richard Smith]

> "Well, you're asking us to skip runtime checks and trap on error instead, we'll do that, but implicitly disable sanitizers which can't be implemented w/o runtime checks".


Yeah, I'd be OK with that, but we'll need to be pretty clear about it in the documentation. (It's not entirely natural that "trap on error" and "don't use the runtime library" are the same thing, but it's the latter that requires us to turn off the vptr sanitizer when the former is enabled.)


http://reviews.llvm.org/D10268

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