Correction to allow compilation with Visual C++.

Patch contributed by Morten Ofstad. Thanks Morten!

llvm-svn: 17123
diff --git a/llvm/lib/Transforms/Scalar/LowerGC.cpp b/llvm/lib/Transforms/Scalar/LowerGC.cpp
index 2e03807..ee31688 100644
--- a/llvm/lib/Transforms/Scalar/LowerGC.cpp
+++ b/llvm/lib/Transforms/Scalar/LowerGC.cpp
@@ -143,8 +143,8 @@
     if (Constant *C = dyn_cast<Constant>(I->getOperand(OpNum))) 
       I->setOperand(OpNum, ConstantExpr::getCast(C, Ty));
     else {
-      CastInst *C = new CastInst(I->getOperand(OpNum), Ty, "", I);
-      I->setOperand(OpNum, C);
+      CastInst *CI = new CastInst(I->getOperand(OpNum), Ty, "", I);
+      I->setOperand(OpNum, CI);
     }
   }
 }