aco: disallow p_extract(,,32,)

Nothing uses these.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31762>

src/amd/compiler/aco_optimizer.cpp

@@ -1027,8 +1027,6 @@ can_apply_extract(opt_ctx& ctx, aco_ptr<Instruction>& instr, unsigned idx, ssa_i
 
    if (!sel) {
       return false;
-   } else if (sel.size() == 4) {
-      return true;
    } else if ((instr->opcode == aco_opcode::v_cvt_f32_u32 ||
                instr->opcode == aco_opcode::v_cvt_f32_i32) &&
               sel.size() == 1 && !sel.sign_extend() && !instr->usesModifiers()) {