Silence optimized warnings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19797 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 75d1962..74f1c55 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1454,7 +1454,7 @@
   SDOperand InChain = FindInputOutputChains(Source.Val, OutChain,
                                             DAG.getEntryNode());
 
-  const char *FnName;
+  const char *FnName = 0;
   if (isSigned) {
     if (DestTy == MVT::f32)
       FnName = "__floatdisf";