Request for reviews (XXS): 7003130: assert(iterations<CG_BUILD_ITER_LIMIT) failed: infinite EA connection graph

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7003130/webrev

Fixed 7003130: assert(iterations<CG_BUILD_ITER_LIMIT) failed: infinite EA connection graph

It seems, 10 for CG_BUILD_ITER_LIMIT is small.
I rerun current VM with jvm2008 and observed 8 iterations.
So a case with 10 may be not as rare as I thought.
I tried to collect statistic on the correlation
of this number with total number of nodes and number
of particular idead nodes (addp,load,store,call) but
I did not find any correlation. It seems, it depends
more on the order of nodes on worklist than on number
of nodes.

Bumping CG_BUILD_ITER_LIMIT to 20.

Note: in product VM we recompile a method without EA
so it is not a critical problem.