intel/nir: Lower load_global_constant in lower_mem_access_bit_sizes

It's identical to nir_intrinsic_load_global except that it works on data
that's guaranteed to be constant throughout the shader invocation.

Fixes: ff2f44d86585 "intel/fs: Implement nir_intrinsic_load_global_constant"
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6872>
diff --git a/src/intel/compiler/brw_nir_lower_mem_access_bit_sizes.c b/src/intel/compiler/brw_nir_lower_mem_access_bit_sizes.c
index aabf241..bbb210b 100644
--- a/src/intel/compiler/brw_nir_lower_mem_access_bit_sizes.c
+++ b/src/intel/compiler/brw_nir_lower_mem_access_bit_sizes.c
@@ -256,6 +256,7 @@
          nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
          switch (intrin->intrinsic) {
          case nir_intrinsic_load_global:
+         case nir_intrinsic_load_global_constant:
          case nir_intrinsic_load_ssbo:
          case nir_intrinsic_load_shared:
          case nir_intrinsic_load_scratch: