Rename mjit_exec to jit_exec (#6262)
Rename mjit_exec to jit_exec
Rename mjit_exec_slowpath to mjit_check_iseq
Remove mjit_exec references from comments
Rename mjit_exec to jit_exec (#6262)
Rename mjit_exec to jit_exec
Rename mjit_exec_slowpath to mjit_check_iseq
Remove mjit_exec references from comments