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

[Alexey Samsonov]

FWIW, I agree with Richard here. We already have different defaults for which sanitizers are recoverable, and which are not (-fsanitize=addres, unreachable etc.).
We may also have the defaults for which sanitizers trap-on-error (-fsanitize=cfi), and which print diagnostics. I think that adding `-fsanitize-trap=<list>` is the way to go.
I would love to see the ugly mask `-fsanitize=undefined-trap` gone in one way or another. Instead, I'd vote for silently disabling `vptr` sanitizer if the user runs the invocation:

  `clang++ -fsanitize=undefined -fsanitize-trap=undefined`.

"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".


http://reviews.llvm.org/D10268

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