[jdk11u-dev] RFR: 8280007: Enable Neoverse N1 optimizations for Arm Neoverse V1 & N2 [v2]

[Liang Mao]

> Backport of JDK-8280007. The change should be enabled in JDK11 better performance on Neoverse V1/N1/N2. It is quite safe for existing in upstream and 17u for years.
> 
> Additional testing: aarch64 server ARM Neoverse N2 release/fastdebug tier1

Liang Mao has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge remote-tracking branch 'jdk11dev/master' into backport-mmyxym-f823bed0
 - Backport f823bed043dc38d838baaf8c2024ef24b8a50e9b

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

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2425/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2425/files/a8ce3aeb..95e36a4a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2425&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2425&range=00-01

  Stats: 235 lines in 10 files changed: 204 ins; 16 del; 15 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2425.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2425/head:pull/2425

PR: https://git.openjdk.org/jdk11u-dev/pull/2425