Remove a warning

llvm-svn: 28607
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index c3a4391..a622e81 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -874,7 +874,7 @@
     if (ObjSize > 4)
       ArgIncrement = ObjSize;
 
-    unsigned Reg;
+    unsigned Reg = 0;
     SDOperand ArgValue;
     if (ObjIntRegs || ObjXMMRegs) {
       switch (ObjectVT) {