Add a testcase where we replace a destructor with an alias.

This is a reduced testcase from a cast to Function failing during bootstrap.

llvm-svn: 194430

clang/test/CodeGenCXX/ctor-dtor-alias.cpp

@@ -103,3 +103,19 @@ namespace test7 {
   template class A<int>;
   B::~B() {}
 }
+
+namespace test8 {
+  // Test that we replace ~zed with ~bar which is an alias to ~foo.
+  // CHECK-DAG: call i32 @__cxa_atexit({{.*}}@_ZN5test83barD2Ev
+  // CHECK-DAG: @_ZN5test83barD2Ev = alias {{.*}} @_ZN5test83fooD2Ev
+  struct foo {
+    ~foo();
+  };
+  foo::~foo() {}
+  struct bar : public foo {
+    ~bar();
+  };
+  bar::~bar() {}
+  struct zed : public bar {};
+  zed foo;
+}