nouveau: Add missing nir_opt_algebraic_late.

This was needed for nir_lower_frexp, but it's a win anyway.  shader-db
results:

total gpr in shared programs: 1143621 -> 1143502 (-0.01%)
gpr in affected programs: 33918 -> 33799 (-0.35%)

total instructions in shared programs: 7829415 -> 7820124 (-0.12%)
instructions in affected programs: 1204967 -> 1195676 (-0.77%)

total bytes in shared programs: 71802760 -> 71717352 (-0.12%)
bytes in affected programs: 11031888 -> 10946480 (-0.77%)

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22083>

src/nouveau/codegen/nv50_ir_from_nir.cpp

@@ -3380,6 +3380,8 @@ Converter::run()
    if (nir->info.stage == MESA_SHADER_FRAGMENT)
       NIR_PASS_V(nir, nv_nir_move_stores_to_end);
 
+   NIR_PASS(progress, nir, nir_opt_algebraic_late);
+
    NIR_PASS_V(nir, nir_lower_bool_to_int32);
    NIR_PASS_V(nir, nir_lower_bit_size, Converter::lowerBitSizeCB, this);