[rvm-core] Code freeze

I think it would be sensible to have a temporary freeze on the trunk,  
avoiding all non-essential commits.

1.  There are at least two critical, apparently unrelated performance  
bugs outstanding:

        http://jira.codehaus.org/browse/RVM-758
        http://jira.codehaus.org/browse/RVM-762

Performance is also significantly (but less dramatically) down on  
jbb2000, luindex, jess, db and javac.  Most of the dips appeared  
around 15301 or so, though it is odd since cattrack says that there  
were two perf regressions against 15301, one of which was fine, and  
the other of which was slow (things have remained slow since 15301).    
As a precaution, Daniel has rebooted habanero (the relevant test  
machine).   Anyway, this is disturbing and I'd really like to see it  
figured out before we move forward.

2. Meanwhile Daniel and Fil are trying to get native threads ready for  
prime time and are now very close, so minimizing churn on the head  
will help a great deal.

I would also like to flip production to GenImmix, but to monitor  
performance etc, it will help if things are stable, though this does  
not require a code freeze, and I'll wait till the performance issues  
are ironed out before I do that.

Cheers,

--Steve

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