java.security & classloader patches checked in

[Bryce McKinlay]

Here's the patch I checked in to the trunk along with the import/merge
of all the java.security classes from classpath. There was also a small
compiler patch that was approved a few weeks back. I intend to backport
some of the ClassLoader bits to the branch, but not the java.security
and protectionDomain parts, since that seems to be what we've agreed on.

There seem to be some serious problems currently with the trunk at -O2
that make meaningful testing impossible - however all seems to be well
with a `make GCJFLAGS="-g"' build of libgcj.

regards

   [ bryce ]