nir: More NIR_MAX_VEC_COMPONENTS fixes

A couple of these probably aren't strictly necessary but they won't
hurt.  The one that's particularly tricky is a fixed-length array in
nir_search.h.  However, to avoid blowing up the binary size of
nir_opt_algebraic by about 2x, we just assert that only small ops are
used.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6655>

src/compiler/nir/nir_opt_if.c

@@ -1125,7 +1125,7 @@ propagate_condition_eval(nir_builder *b, nir_if *nif, nir_src *use_src,
    if (!evaluate_if_condition(nif, b->cursor, &bool_value))
       return false;
 
-   nir_ssa_def *def[4] = {0};
+   nir_ssa_def *def[NIR_MAX_VEC_COMPONENTS] = {0};
    for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++) {
       if (alu->src[i].src.ssa == use_src->ssa) {
          def[i] = nir_imm_bool(b, bool_value);