[PATCH] [OPENMP] A helper for marking intstructions with llvm.mem.parallel_loop_access

[Alexander Musman]

Hi doug.gregor, rjmccall, rsmith, ABataev, hfinkel, gribozavr, cbergstrom, rengolin, TylerNowicki,

This patch adds a helper class (CGLoopInfo) for marking memory instructions with llvm.mem.parallel_loop_access metadata.
It also adds a simple initial version of codegen for pragma omp simd (it will change in the future to support all the clauses).

http://reviews.llvm.org/D3644

Files:
  lib/CodeGen/CGBuilder.h
  lib/CodeGen/CGLoopInfo.cpp
  lib/CodeGen/CGLoopInfo.h
  lib/CodeGen/CGStmt.cpp
  lib/CodeGen/CGStmtOpenMP.cpp
  lib/CodeGen/CMakeLists.txt
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/CodeGenFunction.h
  test/OpenMP/simd_metadata.c
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