Request for reviews (S): 6672848: Escape Analysis: improve lock elimination with EA

[Vladimir Kozlov]

http://webrev.invokedynamic.info/kvn/6672848/index.html

Fixed 6672848: Escape Analysis: improve lock elimination with EA

Problem:
Improve locks elimination based on an allocation escape state from EA.

Solution:
Remove MemBar nodes associated with elided lock/unlock nodes and
specify in debug info which locks should be restored during
deoptimization.

Thanks,
Vladimir