* YJIT: Avoid creating a vector in get_temp_regs()

Co-authored-by: Alan Wu <alansi.xingwu@shopify.com>

* Remove unused import

---------

Co-authored-by: Alan Wu <alansi.xingwu@shopify.com>
Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>