[PATCH] [CUDA] Allow using integral non-type template parameters as launch_bounds attribute arguments.

[Artem Belevich]

Hi rsmith, eliben,

Allow using integral non-type template parameters as launch_bounds attribute arguments.
    
- Changed CUDALaunchBounds arguments from integers to Expr* so they can
  be saved in AST for instantiation, if needed.
- Added support for template instantiation of launch_bounds attrubute.
- Moved evaluation of launch_bounds arguments to NVPTXTargetCodeGenInfo::
  SetTargetAttributes() where it can be done after template instantiation.
- Amended test cases.

http://reviews.llvm.org/D8985

Files:
  include/clang/Basic/Attr.td
  lib/CodeGen/TargetInfo.cpp
  lib/Sema/SemaDeclAttr.cpp
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  test/CodeGenCUDA/launch-bounds.cu
  test/SemaCUDA/launch_bounds.cu

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