* fixed compilation of length(unicode/ansistring) on JVM target after r25499
    (we previously internally generated assigned(unicode/ansistring) nodes,
     which now cause typecheck errors because there is no special assigned
     handling anymore)

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25557 3ad0048d-3df7-0310-abae-a5850022a9f2
  * also load the methodpointer type for managed VM types. It's required
    now that there is no special assigned handling anymore, because the
    generic "<>nil" code for method pointers loads the "proc" field
    via an internally generated tmethod() typecast (using the
    methodpointer type). Additionally, not loading this type was
    an artefact from the time that it wasn't available yet for the
    JVM target

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25558 3ad0048d-3df7-0310-abae-a5850022a9f2