Request for review (vs) - 7199923

[Jon Masamitsu]

7199923: NPG: tools/javac/T7093325.java timeout

The method has_defined() checks that a class is in
the classloader's list of classes. has_defined() was
used in an assertion when doing marking and
adjusting of pointers in a class. Doing that check
for every class spends too much time looking
down the list of a classloader's classes.

http://cr.openjdk.java.net/~jmasa/7199923/webrev.00/

I'd like to get this back for testing tonight so my
apologies if I cut short the review period.  Please
send your comments in any event and I'll fix
any problems in a second CR.