Description:
------------
On some condition PHP may verify abstract method twice.
First time it does it on early binding and the second time after executing of all ZEND_ADD_INTERFACE opcodes. As result we have not only speed penalty, but also an incorrect error message.

Reproduce code:
---------------
<?php
abstract class A {
  abstract function foo();
}
interface B {
  function bar();
}
class C extends A implements B {
}
?>


Expected result:
----------------
Fatal error: Class C contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods (A::foo, B::bar)

Actual result:
--------------
Fatal error: Class C contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (A::foo)