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  1. JDK
  2. JDK-8325660

[lworld] Update C2 to support new value construction scheme from JEP 401

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      This is an umbrella CR to cover all changes required in C2 code after the transition to the JEP 401 model. See JDK-8326595 and JDK-8327150 for runtime and C1 changes.

      Among the changes introduced by the new model, there are:
        - the removal of primitive value classes and their associated `Q` descriptors
        - the removal of the secondary mirror for value classes
        - removal of the Qdesc bit in JVM_CONSTANT_CLASS constant pools entries

            thartmann Tobias Hartmann
            fparain Frederic Parain
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