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

[Alexey Samsonov]

I agree with Richard here.

As for the implementation, I think we need to delete the code in `Clang::ConstructJob` and decide whether we should enable/disable `-fsanitize=vptr` when we parse sanitizer arguments. This means we should factor out the function, that would tell us, if RTTI is (a) enabled, (b) disabled explicitly by certain argument (e.g. -fno-rtti, -mkernel, ...), (c) disabled implicitly (e.g. if we're targeting PS4). Then this function can be used both in `Clang::ConstructJob` and in `SanitizerArgs` constructor. Probably it can be a method of ToolChain, though I'm not sure here.


http://reviews.llvm.org/D7525

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