More Objective-C++ GC tests.

llvm-svn: 104253
diff --git a/clang/test/CodeGenObjC/objc2-strong-cast.m b/clang/test/CodeGenObjC/objc2-strong-cast.m
index 9ef463c..7291c4e 100644
--- a/clang/test/CodeGenObjC/objc2-strong-cast.m
+++ b/clang/test/CodeGenObjC/objc2-strong-cast.m
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -fobjc-gc -emit-llvm -o %t %s
+// RUN: %clang_cc1 -x objective-c++ -fobjc-gc -emit-llvm -o %t %s
 
 @interface I {
   __attribute__((objc_gc(strong))) signed long *_documentIDs;