[PATCH] [OPENMP] Fix use of unsigned counters in loops with zero trip count.

[John McCall]

LGTM.


================
Comment at: lib/Sema/SemaOpenMP.cpp:2386
@@ +2385,3 @@
+Expr *OpenMPIterationSpaceChecker::BuildPreCond(Scope *S, Expr *Cond) const {
+  // Try to build LB ><>=<= UB.
+  bool Suppress = SemaRef.getDiagnostics().getSuppressAllDiagnostics();
----------------
Cute, but more distracting than helpful. :)  Maybe "Try to build LB <op> UB, where <op> is <, >, <=, or >=."

http://reviews.llvm.org/D9103

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