[PATCH] [OPENMP] Codegen for 'omp master' directive

[Alexey Bataev]

Hi rjmccall, hfinkel, fraggamuffin, ejstotzer,

Patch adds 2 library functions to OpenMPRuntime class - int32 __kmpc_master(ident_t *, int32 gtid) and void __kmpc_end_master(ident_t *, int32 gtid);
For 'omp master' directive the next code is generated:
```
if (__kmpc_master(loc, gtid)) {
  <Associated structured block>;
  __kmpc_end_master(log, gtid);
}
```

http://reviews.llvm.org/D6473

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