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  1. JDK
  2. JDK-8263252

Improve fold_compares c2 optimizations

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      <Follow-up enhancement from JDK-8238812 >

      At least following types of improvements can be done as in initial fix proposal of 8238812.
      1. Extracting existing non-CmpU changes from fold_compares_helper
      2. Support fold_compares to handle CmpU nodes

            Unassigned Unassigned
            rraghavan Rahul Raghavan
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