RFR: 8353572: x86: AMD platforms miss the check for CLWB feature flag [v3]

[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 five additional commits since the last revision:

 - Add assert
 - Merge branch 'master' into JDK-8353572-amd-clwb
 - 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/c9ec23c3..2879eaf7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24385&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24385&range=01-02

  Stats: 2035 lines in 59 files changed: 638 ins; 848 del; 549 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