[PATCH] Add support for CUDA unroll pragma

[Mark Heffernan]

Hi aaron.ballman, eliben, TylerNowicki,

This patch adds support for the loop unroll pragma syntax defined in the CUDA c/c++ language:

// Fully unroll loop.
#pragma unroll
for (...) { }

// Unroll loop N times.
#pragma unroll N
for (...) { }

This pragma is only supported when compiling in CUDA mode (-x cuda).  The "#pragma unroll" and "#pragma unroll N" have identical semantics to "#pragma clang loop unroll(enable)" and "#pragma clang loop unroll_count(N)" respectively.

Mark

http://reviews.llvm.org/D4297

Files:
  docs/ReleaseNotes.rst
  include/clang/Basic/Attr.td
  include/clang/Basic/AttrDocs.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/TokenKinds.def
  include/clang/Parse/Parser.h
  include/clang/Sema/CudaUnrollHint.h
  lib/CodeGen/CGStmt.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/Parse/ParsePragma.cpp
  lib/Parse/ParseStmt.cpp
  lib/Sema/SemaStmtAttr.cpp
  test/CodeGen/cuda-pragma-unroll.cu
  test/Misc/ast-print-cuda-pragmas.cu
  test/PCH/cuda-pragma-unroll.cu
  test/Parser/cuda-pragma-unroll.cu
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