re PR tree-optimization/62091 (ice in before_dom_children)

	PR tree-optimization/62091
	* g++.dg/ipa/devirt-39.C: New.

From-SVN: r214209

gcc/testsuite/g++.dg/ipa/devirt-39.C

+// PR c++/61214
+/* { dg-options "-O2 -fdump-tree-optimized"  } */
+
+struct Base
+{
+  virtual ~Base();
+  virtual Base* clone() {
+    return 0;
+  }
+};
+
+struct Foo : Base
+{
+  virtual ~Foo();
+  virtual Base* clone() {
+    return new Foo();
+  }
+};
+
+int main()
+{
+  Base* f = new Foo();
+  f->clone();
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-not "OBJ_TYPE_REF" "optimized"  } } */
+/* { dg-final { scan-assembler-not "_ZN3Foo5cloneEv" } } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */