mro::method_changed_in(..) ignores AUTOLOAD (RT #60220)

mro::method_changed_in(..) ignores AUTOLOAD (RT #60220)

Patch modified to use a boolean rather than an integer for tracking
mro changes in S_glob_assign_ref and test fixed not to warn.

URL: http://rt.perl.org/rt3/Ticket/Display.html?id=60220

From the bug report:

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When creating a subclass dynamically, and when adding
AUTOLOAD dynamically into the parent class, then that
AUTOLOAD is not seen in the method cache, even after
a call to "mro::method_changed_in('Parent')".

It only appears in the method cache after a call
to mro::invalidate_all_method_caches().

The attached test file demonstrates the problem.

This was detected while trying to solve bug 40159 in DBIx::DataModel.
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Message-ID: <20081031132021.GA21341@mars.tony.develop-help.com>