[pmc] Change usage of GETATTR to GET_ATTR in Sub PMC.
[pmc] Change usage of GETATTR to GET_ATTR in Sub PMC.

This patch unbroke Rakudo. But I don't quite understand why...

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@40675 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot