Handle va_arg instruction correctly


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6030 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/SCCP.cpp b/lib/Transforms/Scalar/SCCP.cpp
index 8b33e22..bddf0af 100644
--- a/lib/Transforms/Scalar/SCCP.cpp
+++ b/lib/Transforms/Scalar/SCCP.cpp
@@ -193,6 +193,7 @@
   void visitCallInst      (Instruction &I) { markOverdefined(&I); }
   void visitInvokeInst    (Instruction &I) { markOverdefined(&I); }
   void visitAllocationInst(Instruction &I) { markOverdefined(&I); }
+  void visitVarArgInst    (Instruction &I) { markOverdefined(&I); }
   void visitFreeInst      (Instruction &I) { /*returns void*/ }
 
   void visitInstruction(Instruction &I) {