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  1. JDK
  2. JDK-8259604

Change the implementation of loadV_partial and storeV_partial in Aarch64-SVE backend

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      Now, the implementation of loadV_partial is :

      mov $tmp1, 0
      mov $tmp2, vector_length
      sve_whilelo $pTmp, $tmp1, $tmp2
      sve_ldr $dst, $pTmp, $mem

      However, we can encode register zr in instruction `sve_whilelo` instead of getting from the first mov instruction.

      The new implementation is :

      mov $tmp, vector_length
      sve_whilelo $pTmp, zr, $tmp
      sve_ldr $dst, $pTmp, $mem

      From this changing, we reduce a mov instruction and a temporary variable($tmp2 ).

            whuang Wang Huang
            whuang Wang Huang
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