[turbofan] Optimize certain chains of Branch into a Switch.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index 646ace2e00e557ebd60ea92c16c8c82c131ae7ff..04b1dc6f57cebff7a001225a92e84c868abf70ec 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -400,7 +400,8 @@ class RawMachineAssembler : public GraphBuilder {
   Label* Exit();
   void Goto(Label* label);
   void Branch(Node* condition, Label* true_val, Label* false_val);
-  void Switch(Node* index, Label** succ_labels, size_t succ_count);
+  void Switch(Node* index, Label* default_label, int32_t* case_values,
+              Label** case_labels, size_t case_count);
   // Call through CallFunctionStub with lazy deopt and frame-state.
   Node* CallFunctionStub0(Node* function, Node* receiver, Node* context,
                           Node* frame_state, CallFunctionFlags flags);