Emit debug info for c++0x nullptr.

llvm-svn: 139752
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 5061e2e..919c5f9 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -302,8 +302,8 @@
     assert(0 && "Unexpected builtin type UnknownAny");
     return llvm::DIType();
   case BuiltinType::NullPtr:
-    assert(0 && "Unexpected builtin type NullPtr");
-    return llvm::DIType();
+    return DBuilder.
+      createNullPtrType(BT->getName(CGM.getContext().getLangOptions()));
   case BuiltinType::Void:
     return llvm::DIType();
   case BuiltinType::ObjCClass: