RFR: 8351152: x86: Remove code blocks that handle UseSSE < 2 [v3]

[Aleksey Shipilev]

> 32-bit x86 was the platform that supported `UseSSE < 2`. 64-bit x86 baselines on `UseSSE >= 2`: https://github.com/openjdk/jdk/blob/567c6885a377e5641deef9cd3498f79c5346cd6a/src/hotspot/cpu/x86/vm_version_x86.cpp#L895-L902
> 
> After 32-bit x86 code is gone, we can remove all code blocks that are there to support `UseSSE < 2`.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `all`

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - Merge branch 'master' into JDK-8351152-x86-sse2-everywhere
 - Also purge vestigial calls to VMVersion::supports_sse{2}
 - Also 24-bit removals
 - Touchups
 - Fix

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Changes: https://git.openjdk.org/jdk/pull/24484/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24484&range=02
  Stats: 822 lines in 17 files changed: 34 ins; 542 del; 246 mod
  Patch: https://git.openjdk.org/jdk/pull/24484.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24484/head:pull/24484

PR: https://git.openjdk.org/jdk/pull/24484