intel/tools: Remove unnecessary reg number checking

a0 is the only address register, and cr0 is the only control register,
so there's no need to return the register number, espcially since the
lexer explicitly consumes "a0" and "cr0".

Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5514>
2 files changed