[Jikesrvm-core] progress on 64 port of the opt compiler

[David P G. <gr...@us...>]

Kris, Sergiy, Darko, et al have made sufficient progress on the 64 bit 
port of the opt compiler that we can enable prototype-opt for the 
PowerPC64 regressions starting tonight.

The current status appears to be that it crashes in SPECjbb2000 with 
prototype-opt, but runs all the rest of the tests successfully. 

Kudos to Kris and Sergiy for all of their hard work!

--dave