[turbofan] First shot at eager deoptimization in Turbofan.

src/compiler/scheduler.cc

Index: src/compiler/scheduler.cc
diff --git a/src/compiler/scheduler.cc b/src/compiler/scheduler.cc
index 9a4c7af6eade6523c345fff23684c0f204168fb5..a0ab947eab6f7fdf2db7aec95473f05e3daa9445 100644
--- a/src/compiler/scheduler.cc
+++ b/src/compiler/scheduler.cc
@@ -345,6 +345,10 @@ class CFGBuilder : public ZoneObject {
         scheduler_->UpdatePlacement(node, Scheduler::kFixed);
         ConnectSwitch(node);
         break;
+      case IrOpcode::kDeoptimize:
+        scheduler_->UpdatePlacement(node, Scheduler::kFixed);
+        ConnectDeoptimize(node);
+        break;
       case IrOpcode::kReturn:
         scheduler_->UpdatePlacement(node, Scheduler::kFixed);
         ConnectReturn(node);
@@ -494,6 +498,13 @@ class CFGBuilder : public ZoneObject {
     schedule_->AddReturn(return_block, ret);
   }
 
+  void ConnectDeoptimize(Node* deopt) {
+    Node* deoptimize_control = NodeProperties::GetControlInput(deopt);
+    BasicBlock* deoptimize_block = FindPredecessorBlock(deoptimize_control);
+    TraceConnect(deopt, deoptimize_block, NULL);
+    schedule_->AddDeoptimize(deoptimize_block, deopt);
+  }
+
   void ConnectThrow(Node* thr) {
     Node* throw_control = NodeProperties::GetControlInput(thr);
     BasicBlock* throw_block = FindPredecessorBlock(throw_control);