[turbofan] First shot at eager deoptimization in Turbofan.

src/compiler/schedule.cc

Index: src/compiler/schedule.cc
diff --git a/src/compiler/schedule.cc b/src/compiler/schedule.cc
index c3ee33a446802c12fd6503a1fb9d696857daf773..f30e5f61ceb9d944a8afdbe0c16ba2a5822f4a62 100644
--- a/src/compiler/schedule.cc
+++ b/src/compiler/schedule.cc
@@ -106,6 +106,8 @@ std::ostream& operator<<(std::ostream& os, const BasicBlock::Control& c) {
       return os << "branch";
     case BasicBlock::kSwitch:
       return os << "switch";
+    case BasicBlock::kDeoptimize:
+      return os << "deoptimize";
     case BasicBlock::kReturn:
       return os << "return";
     case BasicBlock::kThrow:
@@ -239,6 +241,14 @@ void Schedule::AddReturn(BasicBlock* block, Node* input) {
 }
 
 
+void Schedule::AddDeoptimize(BasicBlock* block, Node* input) {
+  DCHECK_EQ(BasicBlock::kNone, block->control());
+  block->set_control(BasicBlock::kDeoptimize);
+  SetControlInput(block, input);
+  if (block != end()) AddSuccessor(block, end());
+}
+
+
 void Schedule::AddThrow(BasicBlock* block, Node* input) {
   DCHECK_EQ(BasicBlock::kNone, block->control());
   block->set_control(BasicBlock::kThrow);