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

[Reid Kleckner]

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


http://reviews.llvm.org/D9036

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