RFR: 8370112: Remove VM_Version::supports_fast_class_init_checks() in platform-specific code

[Fei Yang]

On Mon, 19 Jan 2026 04:34:36 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Please review this simple enhancement to remove runtime checks for `VM_Version::supports_fast_class_init_checks()` in platform specific code, and replace them with asserts - as we know statically whether a given platform supports it.
> 
> The changes are the same for each platform.
> 
> Testing
>  - building all platforms via GHA
>  - tiers 1-3 (sanity)
> 
> Thanks

Looks reasonable to me.

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29293#pullrequestreview-3676303251