RFR (S): 8024943: ciReplay: fails to dump replay data during safepointing

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8024943/webrev.00/
15 lines changed: 11 ins; 0 del; 4 mod

In some situations VM fails to dump compiler replay file (produces empty 
replay_pid%p.log). The reason is that ciEnv::dump_replay_data tries to 
do thread state transition to VM unconditionally and acquire 
Compile_lock. It doesn't always work in context of VM error reporter.

The fix is to provide new method specifically for VM error reporter 
(ciEnv::dump_replay_data_unsafe) which doesn't perform aforementioned 
actions.

Testing: manual (checked that a valid dump is produced for a crash 
during safepointing).

Thanks!

Best regards,
Vladimir Ivanov