[PATCH] Add attributes for AMDGPU register limits.

[Matt Arsenault]

Address review comments. Don't bother emitting the attribute if it's 0

http://reviews.llvm.org/D6288

Files:
  include/clang/Basic/Attr.td
  include/clang/Basic/AttrDocs.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/AttributeList.h
  lib/CodeGen/TargetInfo.cpp
  lib/Sema/SemaDeclAttr.cpp
  test/CodeGenOpenCL/amdgpu-num-gpr-attr.cl
  test/SemaOpenCL/amdgpu-num-register-attrs.cl
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