[PATCH] [OPENMP] Codegen for "omp flush" directive.

[Alexey Bataev]

Hi rjmccall, fraggamuffin, ejstotzer,

For each "omp flush" directive a call to "void __kmpc_flush(ident_t *, ...)" function is generated.
Directive "omp flush" may have an associated list of variables to flush, but currently runtime function ignores them. So the patch generates just "call __kmpc_flush(ident_t *<loc>)".

http://reviews.llvm.org/D6292

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