[PATCH] Add attributes for AMDGPU register limits.

[Matt Arsenault]

This is a performance hint that can be applied to kernels 
to attempt to limit the number of used registers. This adds two attributes,
amdgpu_num_vgpr and amdgpu_num_sgpr. Alternatively, there could only be one
with two arguments. That version would also be usable for Evergreen, which could 
ignore the second argument as a request for the number of SGPRs.

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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