Fixes #[include number of issue this PR fixes - if any]

Summary of Changes Introduced

Multiple SH4 related performance improvements in Simulant's math codebase Tested with own project (Debug, RelDebug and Release)

PR Checklist

I have documented any user-visible changes to the code in the documentation folder
I agree that the changes introduced in this PR are dual-licensed under the LGPL-3.0 and MIT licenses (Why?)
I have added applicable tests, or at least not introduced any failures