[PATCH] [OPENMP] Initial support for '#pragma omp declare simd' directive.

[Alexey Bataev]

Hi rsmith, aaron.ballman, hfinkel, ejstotzer, fraggamuffin,

Inital parsing/sema/serialization/deserialization support for '#pragma omp declare simd' directive.
The declare simd construct can be applied to a function to enable the creation of one or more versions that can process multiple arguments using SIMD instructions from a single invocation from a SIMD loop.
If the function has any declarations, then the declare simd construct for any declaration that has one must be equivalent to the one specified for the definition. Otherwise, the result is unspecified.
This pragma can be aplied many times to the same declaration.
Internally this pragma is represented as an attribute. But we need special processing for this pragma because it must be used before function declaration, this directive is appplied to.
If pragma is applied to method declared/defined in the class lexical context, then the delayed parsing procedure is used.
Also delayed parsing is used for poarsing a pragma itself, because this directive has several clauses that can reference arguments of the associated function/method.

http://reviews.llvm.org/D10599

Files:
  include/clang/AST/ASTMutationListener.h
  include/clang/Basic/Attr.td
  include/clang/Basic/DiagnosticParseKinds.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/OpenMPKinds.def
  include/clang/Parse/Parser.h
  include/clang/Sema/Sema.h
  include/clang/Serialization/ASTWriter.h
  lib/AST/DeclPrinter.cpp
  lib/Basic/OpenMPKinds.cpp
  lib/Frontend/MultiplexConsumer.cpp
  lib/Parse/ParseDeclCXX.cpp
  lib/Parse/ParseOpenMP.cpp
  lib/Parse/Parser.cpp
  lib/Sema/SemaOpenMP.cpp
  lib/Serialization/ASTCommon.h
  lib/Serialization/ASTReaderDecl.cpp
  lib/Serialization/ASTWriter.cpp
  test/OpenMP/declare_simd_ast_print.c
  test/OpenMP/declare_simd_ast_print.cpp
  test/OpenMP/declare_simd_messages.cpp

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