remove useless code

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@207360 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index 56fa69a..1f761d5 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -4877,7 +4877,6 @@
   if (!Ty)
     return 0;
 
-  Arg = E->getArg(TblPos);
   unsigned nElts = VTy->getNumElements();
 
   CodeGen::CGBuilderTy &Builder = CGF.Builder;