Looks very nice, thanks.  Only one serious question.

================
Comment at: lib/CodeGen/CGOpenMPRuntime.cpp:1626
@@ +1625,3 @@
+  //  *(Type<n>-1*)lhs[<n>-1] = 
ReductionOperation<n>-1(*(Type<n>-1*)lhs[<n>-1],
+  //  *(Type<n>-1*)rhs[<n>-1]);
+  CodeGenFunction::OMPPrivateScope Scope(CGF);
----------------
Writing the second line actually makes this less clear.  I would just write one 
line in terms of "i", like
  *(Type<i>*)lhs[i] = ...

================
Comment at: lib/CodeGen/CGOpenMPRuntime.cpp:1782
@@ +1781,3 @@
+    };
+    CGF.EHStack.pushCleanup<CallEndCleanup>(
+        NormalAndEHCleanup, [this, WithNowait, EndArgs](CodeGenFunction &CGF) {
----------------
Pushing the cleanup immediately before the scope is left like this doesn't do 
anything except emit it immediately on the normal path.  Did you mean to push 
it before doing any of the reduction operations?

http://reviews.llvm.org/D8915

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