[PATCH] Sema: Accept pointers to any address space for builtin functions

[Anastasia]

Shall TODO/comment be added somewhere saying that handling address space number of pointers in builtins is still to be implemented?

Also what the number should be for OpenCL? Should it be taken from LangAS::ID enum?


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Comment at: lib/Sema/SemaExpr.cpp:4393
@@ +4392,3 @@
+
+        Expr *PtrArg = DefaultFunctionArrayLvalueConversion(Arg).get();
+        QualType PtrTy = PtrArg->getType();
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Not sure if this cast might create a problem in some OpenCL-GPU architectures, because spec generally disallows conversion between constant and any other address spaces (see OpenCL C v2.0 s6.5.5). 

I feel like a better way to handle this would be to create separate builtins overloads for constant and generic address space in OpenCL v2.0 and for all address spaces in OpenCL <v2.0. But this seems more work to me.

http://reviews.llvm.org/D8082

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