[lworld] Value type check/guard before synchronization is not hoisted out of the loop

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      Value type check/guard before synchronization is not hoisted out of the loop even if it's possible (locking object is invariant to the loop).
      Some benchmarks show up to 30% perf regression.

      Benchmark location: http://cr.openjdk.java.net/~skuksenko/valhalla/legacy/benchmarks/

      Benchmark: Lock.loopLock

            Assignee:
            Roland Westrelin
            Reporter:
            Sergey Kuksenko
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              Created:
              Updated:
              Resolved: