[jdk21u-dev] RFR: 8324824: AArch64: Detect Ampere-1B core and update default options for Ampere CPUs

[Patrick Zhang]

Hi all,

This pull request contains a backport of commit [9936aeea](https://github.com/openjdk/jdk/commit/9936aeea32b71509151099e6d28905e0322b2bc2) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Patrick Zhang on 8 Feb 2024 and was reviewed by Dean Long and Tobias Hartmann.

Thanks!

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Commit messages:
 - Backport 9936aeea32b71509151099e6d28905e0322b2bc2

Changes: https://git.openjdk.org/jdk21u-dev/pull/249/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=249&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324824
  Stats: 12 lines in 2 files changed: 9 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/249.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/249/head:pull/249

PR: https://git.openjdk.org/jdk21u-dev/pull/249