silence a bogus gcc warning

llvm-svn: 25129
diff --git a/llvm/lib/Target/X86/X86ISelPattern.cpp b/llvm/lib/Target/X86/X86ISelPattern.cpp
index 9ce406b..20c97bc 100644
--- a/llvm/lib/Target/X86/X86ISelPattern.cpp
+++ b/llvm/lib/Target/X86/X86ISelPattern.cpp
@@ -2989,7 +2989,7 @@
 
   // Copy the return address of the caller into a virtual register so we don't
   // clobber it.
-  SDOperand RetVal;
+  SDOperand RetVal(0, 0);
   if (ESPOffset) {
     SDOperand RetValAddr = X86Lowering.getReturnAddressFrameIndex(*TheDAG);
     RetVal = TheDAG->getLoad(MVT::i32, TheDAG->getEntryNode(),