RFR: Don't initially evacuate Synchronizer roots

[Roman Kennke]

I checked all the uses of ObjectMonitor from the Synchronizer monitor
list. In all the places that they are used we do have proper barriers.
There is no place that expects the oop in the monitor to always be to-
space. Therefore we don't need to evacuate those ObjectMonitor roots at
the init-evac pause.

Tested with jtreg and SPECjvm2008

http://cr.openjdk.java.net/~rkennke/noevacsyncroots/webrev.00/

Ok?

Roman