Request for reviews (XS): 7163534: VM could crashes assert(false) failed: infinite EA connection graph build

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7163534/webrev

I don't have time to investigate this problem now, but it affects our testing of 
HS24. So I disabled the assert by default (with new flag). In case of time or 
iterations limit reached C2 stops EA and continue compilation without EA as it 
does in product VM already.

Thanks,
Vladimir