[PATCH] Add support for unroll pragma

[Mark Heffernan]

Thanks all for your comments.  This patch reduces much of the implementation duplication from the previous patch.  Unroll and loop optimization hints now both share the same attribute.

Also, the loop unroll pragma now replaces the "#pragma clang loop unroll/unroll_count" directives which have been removed.  The following unroll pragma forms are supported:

#pragma unroll
#pragma unroll N
#pragma unroll(N)

The parentheses around the unroll count argument are optional.  The form with parentheses is included to maximize compatibility with existing compilers (Intel and IBM compiler use the form with parentheses, CUDA uses the form without).

http://reviews.llvm.org/D4297

Files:
  docs/LanguageExtensions.rst
  docs/ReleaseNotes.rst
  include/clang/Basic/Attr.td
  include/clang/Basic/AttrDocs.td
  include/clang/Basic/DiagnosticParseKinds.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Parse/Parser.h
  include/clang/Sema/LoopHint.h
  lib/Parse/ParsePragma.cpp
  lib/Parse/ParseStmt.cpp
  lib/Sema/SemaStmtAttr.cpp
  test/CodeGen/pragma-loop.cpp
  test/PCH/pragma-loop.cpp
  test/Parser/pragma-loop.cpp
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