X86: Backend support for optimizing vector masked operations over AVX512 target.

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      Extend existing C2 compiler backed to support vector masking operations for AVX512.
        - Register allocation support for opmask registers [K1-K7] (already integrated into mainline JDK-8262355).
        - New instruction selection patterns for masked operations.
        - Relevant support in macro-assembler and assembler.



        

            Assignee:
            Jatin Bhateja
            Reporter:
            Jatin Bhateja
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