RFR: 8275262: Backout JDK-8269559

[Nick Gasson]

This reverts "8269559: AArch64: Implement string_compare intrinsic in SVE" which caused some unknown failures in Oracle's CI.

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

Commit messages:
 - 8275262: Backout JDK-8269559

Changes: https://git.openjdk.java.net/jdk/pull/5941/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5941&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275262
  Stats: 517 lines in 11 files changed: 1 ins; 421 del; 95 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5941.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5941/head:pull/5941

PR: https://git.openjdk.java.net/jdk/pull/5941