RFR: 8275448: [REDO] AArch64: Implement string_compare intrinsic in SVE [v3]

[TatWai Chong]

> After JDK-8269559 was integrated there are failures in tier1 testing
> across Mac OS X 11.4 (aarch64) machines. Please see JDK-8275263.
> 
> This patch is NOT functional; rather, this tends to verify potential
> toolchain issues as the original patch pass testing on other
> platforms.
> 
> In this patch, we remove new SVE-related matching rules and register
> class introduced in the original patch to minimally affect the
> non-SVE part.

TatWai Chong has updated the pull request incrementally with one additional commit since the last revision:

  Add the matching rule in td file, enable control path in the code stub.

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6072/files
  - new: https://git.openjdk.java.net/jdk/pull/6072/files/c173d9c4..c5f61f57

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6072&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6072&range=01-02

  Stats: 163 lines in 3 files changed: 159 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6072.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6072/head:pull/6072

PR: https://git.openjdk.java.net/jdk/pull/6072