RFR: 8353572: x86: AMD platforms miss the check for CLWB feature flag [v2]

[Aleksey Shipilev]

> Noticed this when doing [JDK-8353558](https://bugs.openjdk.org/browse/JDK-8353558). We only check for CLWB feature flag for Intel platforms. But AMD APM (Rev. 3.36—March 2024) tells me there is a CLWB flag in CPUID Fn0000_0007_EBX_x0 leaf as well. It is in the same place as the flag for Intel.
> 
> Additional testing:
>  - [x] Ad-hoc tests on Ryzen 5950X

Aleksey Shipilev 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 three additional commits since the last revision:

 - More feature flag commonning
 - Merge branch 'master' into JDK-8353572-amd-clwb
 - Fix

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/24385/files
  - new: https://git.openjdk.org/jdk/pull/24385/files/eae1c04f..c9ec23c3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24385&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24385&range=00-01

  Stats: 22473 lines in 760 files changed: 15305 ins; 5220 del; 1948 mod
  Patch: https://git.openjdk.org/jdk/pull/24385.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24385/head:pull/24385

PR: https://git.openjdk.org/jdk/pull/24385