nir: Remove stale todo

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24432>

src/compiler/nir/nir.c

@@ -690,7 +690,6 @@ nir_alu_instr *
 nir_alu_instr_create(nir_shader *shader, nir_op op)
 {
    unsigned num_srcs = nir_op_infos[op].num_inputs;
-   /* TODO: don't use calloc */
    nir_alu_instr *instr = gc_zalloc_zla(shader->gctx, nir_alu_instr, nir_alu_src, num_srcs);
 
    instr_init(&instr->instr, nir_instr_type_alu);
@@ -752,7 +751,6 @@ nir_intrinsic_instr *
 nir_intrinsic_instr_create(nir_shader *shader, nir_intrinsic_op op)
 {
    unsigned num_srcs = nir_intrinsic_infos[op].num_srcs;
-   /* TODO: don't use calloc */
    nir_intrinsic_instr *instr =
       gc_zalloc_zla(shader->gctx, nir_intrinsic_instr, nir_src, num_srcs);