RFR: Merge jdk18

[Jesper Wilhelmsson]

Forwardport JDK 18 -> JDK 19

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Commit messages:
 - Merge
 - 8280415: Remove EA from JDK 18 version string starting with Initial RC promotion B35 on February 10, 2022
 - 8281713: [BACKOUT] AArch64: Implement string_compare intrinsic in SVE

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.java.net/?repo=jdk&pr=7509&range=00.0
 - jdk18: https://webrevs.openjdk.java.net/?repo=jdk&pr=7509&range=00.1

Changes: https://git.openjdk.java.net/jdk/pull/7509/files
  Stats: 423 lines in 9 files changed: 0 ins; 412 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7509.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7509/head:pull/7509

PR: https://git.openjdk.java.net/jdk/pull/7509