[PATCH] [OPENMP] Codegen for 'ordered' directive.

[Alexey Bataev]

Hi rjmccall, hfinkel, ejstotzer, fraggamuffin,

Add codegen for 'ordered' directive:
```
__kmpc_ordered(ident_t *, gtid);
<associated statement>;
__kmpc_end_ordered(ident_t *, gtid);
```

Also for 'for' directives with the dynamic scheduling and an 'ordered' clause added a call to '__kmpc_dispatch_fini_(4|8)[u]()' function after increment expression for loop control variable:
```
while(__kmpc_dispatch_next(&LB, &UB)) {
  idx = LB;
  while (idx <= UB) { BODY; ++idx;
  __kmpc_dispatch_fini_(4|8)[u](); // For ordered loops only.
  } // inner loop
}
```

http://reviews.llvm.org/D9070

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

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