Check for ret, so that we know we hit the end of the function

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99448 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGenCXX/references.cpp

@@ -153,4 +153,5 @@ void f0(s1 a) { s1 b = a; }
 // CHECK: alloca
 // CHECK: store
 // CHECK: load
+// CHECK: ret
 const int &f2() { return 0; }