src/compiler: use new hash table and set creation helpers

Replace calls to create hash tables and sets that use
_mesa_hash_pointer/_mesa_key_pointer_equal with the helpers
_mesa_pointer_hash_table_create() and _mesa_pointer_set_create().

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Acked-by: Eric Engestrom <eric@engestrom.ch>

src/compiler/nir/nir_remove_dead_variables.c

@@ -164,8 +164,7 @@ bool
 nir_remove_dead_variables(nir_shader *shader, nir_variable_mode modes)
 {
    bool progress = false;
-   struct set *live =
-      _mesa_set_create(NULL, _mesa_hash_pointer, _mesa_key_pointer_equal);
+   struct set *live = _mesa_pointer_set_create(NULL);
 
    add_var_use_shader(shader, live, modes);