Fix disturbing warning - NFCI

llvm-svn: 347186
diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 01f0e76..d2ddb32 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -2798,7 +2798,7 @@
 }
 
 bool PhiNodeSetIterator::operator!=(const PhiNodeSetIterator &RHS) const {
-  return CurrentIndex != RHS.CurrentIndex;
+  return !((*this) == RHS);
 }
 
 /// Keep track of simplification of Phi nodes.