brw: Perform mark_last_urb_write_with_eot optimization after CFG

Avoid using exec_node::remove() and the initial "main list of
instructions", and instead use the existing helpers like other
passes.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37146>

src/intel/compiler/brw/brw_compile_gs.cpp

@@ -110,13 +110,13 @@ run_gs(brw_shader &s)
 
    brw_from_nir(&s);
 
-   brw_emit_gs_thread_end(s);
-
    if (s.failed)
       return false;
 
    brw_calculate_cfg(s);
 
+   brw_emit_gs_thread_end(s);
+
    brw_optimize(s);
 
    s.assign_curb_setup();

src/intel/compiler/brw/brw_compile_tcs.cpp

@@ -176,13 +176,13 @@ run_tcs(brw_shader &s)
       bld.emit(BRW_OPCODE_ENDIF);
    }
 
-   brw_emit_tcs_thread_end(s);
-
    if (s.failed)
       return false;
 
    brw_calculate_cfg(s);
 
+   brw_emit_tcs_thread_end(s);
+
    brw_optimize(s);
 
    s.assign_curb_setup();

src/intel/compiler/brw/brw_shader.cpp

@@ -578,23 +578,47 @@ brw_barycentric_mode(const struct brw_wm_prog_key *key,
 bool
 brw_shader::mark_last_urb_write_with_eot()
 {
-   brw_foreach_in_list_reverse(brw_inst, prev, &this->instructions) {
+   brw_inst *limit = NULL;
-      if (prev->opcode == SHADER_OPCODE_URB_WRITE_LOGICAL) {
+   foreach_block_reverse(block, cfg) {
-         prev->eot = true;
+      foreach_inst_in_block_reverse(brw_inst, inst, block) {
-
+         if (inst->opcode == SHADER_OPCODE_URB_WRITE_LOGICAL) {
-         /* Delete now dead instructions. */
+            inst->eot = true;
-         brw_foreach_in_list_reverse_safe(brw_exec_node, dead, &this->instructions) {
+            limit = inst;
-            if (dead == prev)
+            break;
-               break;
+         } else if (inst->is_control_flow() || inst->has_side_effects()) {
-            dead->remove();
+            limit = inst;
+            break;
          }
-         return true;
-      } else if (prev->is_control_flow() || prev->has_side_effects()) {
-         break;
       }
+
+      if (limit)
+         break;
    }
 
-   return false;
+   if (!limit || !limit->eot)
+      return false;
+
+   brw_analysis_dependency_class dep = BRW_DEPENDENCY_INSTRUCTION_DETAIL;
+
+   /* Delete now dead instructions. */
+   bool done = false;
+   foreach_block_reverse(block, cfg) {
+      foreach_inst_in_block_reverse_safe(brw_inst, dead, block) {
+         if (dead == limit) {
+            done = true;
+            break;
+         }
+
+         dep = dep | BRW_DEPENDENCY_INSTRUCTION_IDENTITY;
+         dead->remove();
+      }
+
+      if (done)
+         break;
+   }
+
+   invalidate_analysis(dep);
+   return true;
 }
 
 static unsigned