[PATCH] Change how we deal with (implicit) -fno-rtti + -fsanitize=vptr

[Richard Smith]

I don't think this is the right approach; the `-fsanitize=` setting deliberately doesn't affect whether RTTI is enabled, and I don't think we should change that. I think we should do the following:

- If `-fsanitize=vptr` is explicitly specified and RTTI is disabled, we should issue an error.
- If `-fsanitize=vptr` is implied by some sanitizer group (such as `-fsanitize=undefined`) and RTTI is disabled, we should not enable the vptr sanitizer (perhaps with a warning).

That presumably means handling this when we parse the sanitizer arguments, which might require us to reorder the processing of the arguments a bit.


http://reviews.llvm.org/D7525

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