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

[Artem Belevich]

Addressed review comments by eliben@ and aaron@

- Improved argument type/value checking.
- Added a warning on negative launch_bounds arguments and disabled corresponding PTX directive emission when that happens.
- Added test cases for various invalid launch_bounds arguments.


http://reviews.llvm.org/D8985

Files:
  include/clang/Basic/Attr.td
  include/clang/Basic/DiagnosticSemaKinds.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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