RFR: 8282024: add EscapeAnalysis statistics under PrintOptoStatistics [v14]

[Xin Liu]

On Sat, 21 May 2022 15:55:44 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Got it. Thank for explaining - you simply used data from last iteration.
>> I think you can do similar with much less complexity if you used data from **first** iteration and current code change:
>> 
>> void ConnectionGraph::escape_state_statistics(GrowableArray<JavaObjectNode*>& java_objects_worklist) {
>>   if (!PrintOptoStatistics || (_invocation > 0)) { // Collect data only for first invocation
>>     return;
>>   }
>>   for (int next = 0; next < java_objects_worklist.length(); ++next) {
>
> You need to revert `escape_state_statistics` back to non static for this of cause.

so you use the snapshot of first iteration. We assume Iterative EA can elide some non-escaped objects but can't change any object's category.  I think it is correct and indeed much simpler!

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PR: https://git.openjdk.java.net/jdk/pull/8019