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

[Artem Belevich]

Addressed Richard Smith's review comments:

- Consolidated attribute creation and argument checking into Sema::AddLaunchBoundsAttr() which is now used from both SemaDeclAttr.cpp and SemaTemplateInstantiateDecl.cpp
- Let Expr::isIntegerConstantExpr() do the job of checking and reporting argument type errors.
- Use DiagnoseUnexpandedParameterPack() to report parameter packs when we reject them.


http://reviews.llvm.org/D8985

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