re PR c++/90909 (call devirtualized to pure virtual)

/cp
2019-06-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/90909
	Revert:
	2019-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/67184
	PR c++/69445
	* call.c (build_over_call): Devirtualize when the final overrider
	comes from the base.

/testsuite
2019-06-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/90909
	Revert:
	2019-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/67184
	PR c++/69445
	* g++.dg/other/final3.C: New.
	* g++.dg/other/final4.C: Likewise.
	* g++.dg/other/final5.C: Likewise.

	* g++.dg/other/final6.C: New.

From-SVN: r272574

gcc/testsuite/g++.dg/other/final3.C

-// PR c++/67184
-// { dg-do compile { target c++11 } }
-// { dg-options "-fdump-tree-original"  }
-
-struct V {
- virtual void foo(); 
-};
-
-struct wV final : V {
-};
-
-struct oV final : V {
-  void foo();
-};
-
-void call(wV& x)
-{
-  x.foo();
-  x.V::foo();
-}
-
-void call(oV& x)
-{
-  x.foo();
-  x.V::foo();
-}
-
-// { dg-final { scan-tree-dump-times "OBJ_TYPE_REF" 0 "original" } }

gcc/testsuite/g++.dg/other/final4.C

-// PR c++/67184
-// { dg-do compile { target c++11 } }
-// { dg-options "-fdump-tree-original"  }
-
-struct B
-{
-  virtual void operator()();
-  virtual operator int();
-  virtual int operator++();
-};
-
-struct D final : B { };
-
-void foo(D& d) { d(); int t = d; ++d; }
-
-// { dg-final { scan-tree-dump-times "OBJ_TYPE_REF" 0 "original" } }

gcc/testsuite/g++.dg/other/final5.C

-// PR c++/69445
-// { dg-do compile { target c++11 } }
-// { dg-options "-fdump-tree-original"  }
-
-struct Base {
-  virtual void foo() const = 0;
-  virtual void bar() const {}
-};
-
-struct C final : Base {
-  void foo() const { }
-};
-
-void func(const C & c) {
-  c.bar();
-  c.foo();
-}
-
-// { dg-final { scan-tree-dump-times "OBJ_TYPE_REF" 0 "original" } }