[PATCH] Create a frontend flag to disable CUDA cross-target call checks

[Eli Bendersky]

In http://reviews.llvm.org/D9036#156719, @rnk wrote:

> As discussed, this flag actually affects overload resolution results, so it should probably be a language option as it is now. Maybe we shouldn't be having this target check affect overload results, but that's another big issue that we don't need to run down right this instant.
>
> lgtm


Right. In the long run, I think that letting it affect overload resolution is actually beneficial if we want to consider proper overloading based on target attributes.


http://reviews.llvm.org/D9036

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