[PMC] Added a quick constant string pointer check to Default PMC's isa as a minor optimization.
[PMC] Added a quick constant string pointer check to Default PMC's isa as a
minor optimization.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@47787 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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