[PATCH] [OPENMP] Codegen for 'private' clause in 'single' directive.

[Alexey Bataev]

Hi rjmccall, hfinkel,

Emit the following code for 'single' directive with 'private' clause:
```
if (@__kmpc_single()) {
<default init for privates>
@__kmpc_end_single();
}

```

http://reviews.llvm.org/D9238

Files:
  lib/CodeGen/CGStmtOpenMP.cpp
  test/OpenMP/single_private_codegen.cpp

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