intel/compiler: revert part of "Move earlier scheduler code that is not mode-specific"

This removed a bunch of calls from the vec4 code that aren't called anywhere else.

Bring back the bits that were removed.

Fixes glxgears on gen5

Fixes: 81594d0db1 ("intel/compiler: Move earlier scheduler code that is not mode-specific")
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26862>

src/intel/compiler/brw_schedule_instructions.cpp

@@ -2019,6 +2019,11 @@ vec4_instruction_scheduler::run()
          n->issue_time = 2;
       }
 
+      calculate_deps();
+
+      compute_delays();
+      compute_exits();
+
       assert(current.available.is_empty());
       for (schedule_node *n = current.start; n < current.end; n++) {
          reset_node_tmp(n);