[PATCH] [OPENMP] Codegen for 'omp barrier' directive.

[Alexey Bataev]

Hi rjmccall, ejstotzer, fraggamuffin,

Adds generation of call to "i32 __kmpc_cancel_barrier(ident_t *, i32)" libcall for explicitly specified barriers (OMP_IDENT_BARRIER_EXPL flag is added to "flags" field of "ident_t" structure).
Also this patch replaces all calls to "__kmpc_barrier" function by calls of "__kmpc_cancel_barrier" function which provides additional functionality for OpenMP 4.0.
Also, library specific enum OpenMPLocationFlags moved to private section of CGOpenMPRuntime class to make it more independent from library implementation.

http://reviews.llvm.org/D6447

Files:
  lib/CodeGen/CGOpenMPRuntime.cpp
  lib/CodeGen/CGOpenMPRuntime.h
  lib/CodeGen/CGStmtOpenMP.cpp
  test/OpenMP/parallel_firstprivate_codegen.cpp
  test/OpenMP/parallel_private_codegen.cpp
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