hopefully silence a warning on the clang-i386-darwin9 tester.

llvm-svn: 95812
diff --git a/clang/lib/CodeGen/CGExprConstant.cpp b/clang/lib/CodeGen/CGExprConstant.cpp
index 5800ce77..3df552d7 100644
--- a/clang/lib/CodeGen/CGExprConstant.cpp
+++ b/clang/lib/CodeGen/CGExprConstant.cpp
@@ -1027,7 +1027,7 @@
   
   // Itanium C++ ABI 2.3:
   //   A NULL pointer is represented as -1.
-  return llvm::ConstantInt::get(getTypes().ConvertTypeForMem(T), -1, 
+  return llvm::ConstantInt::get(getTypes().ConvertTypeForMem(T), -1ULL, 
                                 /*isSigned=*/true);
 }