Add x86 back-end implementation for LEADING and TRAILING ZEROS COUNT operations

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      - Extend SLP vectorizer to auto-vectorize following Java SE APIs.
           1) Integer.numberOfLeadingZeros()
           2) Long.numberOfLeadingZeros()
           3) Integer.numberOfTrailingZeros()
           4) Long.numberOfTrailingZeros()

      - Add optimized X86 backend implementation for VectorOperations.LEADING_ZERO_COUNT and VectorOperations.TRAILING_ZEROS_COUNT
        for AVX512 and legacy targets.

            Assignee:
            Jatin Bhateja
            Reporter:
            Jatin Bhateja
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