[release/6.0] JIT: don't clone loops where init or limit is a cast local (#57685)

[release/6.0] JIT: don't clone loops where init or limit is a cast local (#57685)

* JIT: don't clone loops where init or limit is a cast local

The loop cloner assumes all computations it introduces are compatible
with TYP_INT, so don't allow cloning when the initial or final value
are variables with incompatible types.

Fixes #57535.

* Apply suggestions from code review

Co-authored-by: SingleAccretion <62474226+SingleAccretion@users.noreply.github.com>
Co-authored-by: Andy Ayers <andya@microsoft.com>
Co-authored-by: SingleAccretion <62474226+SingleAccretion@users.noreply.github.com>