src/class-output.lisp: Output effective methods directly from the class.

src/class-output.lisp: Output effective methods directly from the class.

Earlier there was a bug where effective methods and method entries were
emitted twice, because there were two paths to them: one directly from
the class, and one via method entry points.  To resolve this, I removed
the path directly from the class.

This turns out to have been the wrong choice, because method entries are
found once for each chain, so there are still duplicates in classes with
more than one chain carrying methods.  So don't iterate from method
entries to effective methods, and reinstate the direct path from the
top-level class.