JDK-8218163 : C2: Continuous deoptimization w/ Reason_speculate_class_check and Action_none
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Continuous deoptimization w/ Reason_speculate_class_check and Action_none when recompilation count is too high.
Affects EarleyBoyer benchmark (Octane/Nashorn) and manifests as bimodal distribution of scores.
Fix Request (11u)
This alleviates bad compilation conditions when devirtualized callsite is constantly changing. The patch would fallback to virtual call in those conditions. The patch applies cleanly to 11u, passes tier1, tier2 tests. Ran earley-boyer benchmark from octane.js (not the same Vladimir has), the performance is on par with the baseline.