Move tests of the ObjC++ front-end to their own

directory: some people (guess who!) may build llvm-gcc
with support for objc but not with support for objc++.

llvm-svn: 54471

llvm/test/FrontendObjC++/dg.exp

@@ -0,0 +1,5 @@
+load_lib llvm.exp
+
+if [ llvm_gcc_supports objc++ ] then {
+    RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{mm}]]
+}

llvm/test/FrontendObjC/dg.exp

@@ -2,6 +2,4 @@ load_lib llvm.exp
 
 if [ llvm_gcc_supports objc ] then {
     RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{m}]]
-    RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{mm}]]
 }
-