aco: add a helper for building a trap handler shader

It's way easier to write a trap handler shader using ACO IR
instead of writing disassembly by hand + clrxasm + copy&paste.

This trap handler is quite simple for now, it just loads a
buffer descriptor from the TMA BO, it saves ttmp0-1 which
contain various info about the faulty instruction, and it
stores some hw registers about the wave/trap status.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6384>