RFR: 8344093: Implement JEP 501: Deprecate the 32-bit x86 Port for Removal [v6]

[Aleksey Shipilev]

> WIP, as the JEP is still not targeted. We can review code meanwhile.
> 
> Additional testing:
>  - [x] Linux x86-32 build configure fails by default
>  - [x] Linux x86-32 build configures well with `--enable-deprecated-ports=yes`
>  - [x] GHA

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Update build docs

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22062/files
  - new: https://git.openjdk.org/jdk/pull/22062/files/324a1765..907164ce

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22062&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22062&range=04-05

  Stats: 8 lines in 2 files changed: 0 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/22062.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22062/head:pull/22062

PR: https://git.openjdk.org/jdk/pull/22062