Update toggleHideDead to show dead nodes too

It was hiding the nodes, but never showing them. Therefore it wasn't
'toggling'.

Change-Id: I6fe57860f44ba05abac0f1575678a494f9d07ae8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1649557Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Auto-Submit: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62057}

tools/turbolizer/src/graph-view.ts

@@ -411,7 +411,11 @@ export class GraphView extends PhaseView {
 
   toggleHideDead(view: GraphView) {
     view.state.hideDead = !view.state.hideDead;
-    if (view.state.hideDead) view.hideDead();
+    if (view.state.hideDead) {
+      view.hideDead();
+    } else {
+      view.showDead();
+    }
     const element = document.getElementById('toggle-hide-dead');
     element.classList.toggle('button-input-toggled', view.state.hideDead);
   }
@@ -426,6 +430,15 @@ export class GraphView extends PhaseView {
     this.updateGraphVisibility();
   }
 
+  showDead() {
+    for (const n of this.graph.nodes()) {
+      if (!n.isLive()) {
+        n.visible = true;
+      }
+    }
+    this.updateGraphVisibility();
+  }
+
   hideUnselectedAction(view: GraphView) {
     for (const n of view.graph.nodes()) {
       if (!view.state.selection.isSelected(n)) {