Make sorting of ConstantInt be APInt clean through use of ult function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34853 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/SimplifyCFG.cpp

@@ -1167,7 +1167,7 @@ namespace {
   /// applications that sort ConstantInt's to ensure uniqueness.
   struct ConstantIntOrdering {
     bool operator()(const ConstantInt *LHS, const ConstantInt *RHS) const {
-      return LHS->getZExtValue() < RHS->getZExtValue();
+      return LHS->getValue().ult(RHS->getValue());
     }
   };
 }