[PATCH] [OPENMP] Codegen for "#pragma omp atomic write"

[David Majnemer]

================
Comment at: lib/CodeGen/CGStmtOpenMP.cpp:859
@@ +858,3 @@
+  else
+    CGF.EmitAtomicStore(ExprRValue, XLValue, /*isInit=*/false);
+  // OpenMP, 2.12.6, atomic Construct
----------------
Shouldn't you use `monotonic` ordering if the `omp write` isn't `seq_cst`?

http://reviews.llvm.org/D7369

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