This issue is to remove M_Version::supports_fast_class_init_checks() in platform-specific code as mentioned by [~vlivanov] here https://github.com/openjdk/jdk/pull/27676#discussion_r2427371470

"FTR VM_Version::supports_fast_class_init_checks() is redundant in platform-specific code.

The method is intended to be used in shared code to support dispatching between 2 execution modes, but for each platform is it known well ahead whether fast class init checks are supported or not.

(It does make sense to keep it as an assert through.)"