[jdk21u-dev] RFR: 8341194: [REDO] Implement C2 VectorizedHashCode on AArch64

[Chad Rakoczy]

Backport [JDK-8341194](https://bugs.openjdk.org/browse/JDK-8341194) [REDO] Implement C2 VectorizedHashCode on AArch64

Backport is clean. Trivial merge conflicts with includes and already present code. Original implementation [JDK-8322770](https://bugs.openjdk.org/browse/JDK-8322770) caused build and test failures. Build failures that were reproducible with `make bootcycle-images` run on `linux-aarch64 fastdebug/release` successfully. All jtreg and new asmtest pass on `linux-aarch64 release`.

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Commit messages:
 - Backport 4fc6d4135e795d18a024a6035908f380b81082d1

Changes: https://git.openjdk.org/jdk21u-dev/pull/1170/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1170&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341194
  Stats: 1329 lines in 12 files changed: 748 ins; 0 del; 581 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1170.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1170/head:pull/1170

PR: https://git.openjdk.org/jdk21u-dev/pull/1170