Shark checkcast and instanceof improvements (part 2)

[Gary Benson]

Hi all,

This commit adds some compile-time type checking to the instanceof
and checkcast bytecodes.  It doesn't actually do anything at the
moment because of the way Shark handles state (see PR IcedTea/346)
but hopefully I can change that soon.

Cheers,
Gary

-- 
http://gbenson.net/