[PATCH] MS ABI: Implement /volatile:ms

[Alexey Bataev]

================
Comment at: lib/CodeGen/CGStmtOpenMP.cpp:836
@@ -834,1 +835,3 @@
+                                        IsSeqCst ? llvm::SequentiallyConsistent
+                                                 : llvm::Unordered);
   // OpenMP, 2.12.6, atomic Construct
----------------
I'd say that if IsSeqCst is false, Atomic Ordering must be Monotonic rather than Unordered.
1. According to OpenMP 4.0 "non-sequentially consistent atomic construct has the same semantics as a
memory_order_relaxed atomic operation in C++11/C11.". 
2. According to http://llvm.org/docs/Atomics.html "Monotonic... This corresponds to the C++11/C11 memory_order_relaxed"

http://reviews.llvm.org/D7580

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