Added test for r174461 that checks that the desired behavior also occurs in ObjC++ alongside ObjC.

\end paranoia.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174471 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGenObjCXX/externally-initialized-selectors.mm

@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -cc1 -fobjc-runtime=macosx-fragile-10.5 -o - -emit-llvm %s | FileCheck %s
+// RUN: %clang_cc1 -cc1 -o - -emit-llvm %s | FileCheck %s
+
+// CHECK: @"\01L_OBJC_SELECTOR_REFERENCES_" = internal externally_initialized global
+
+void test(id x) {
+  [x doSomething];
+}