[turbofan] Initial support for 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 ef1f31ce8b2490635d32aa0a3e93dc50b44b48a3..f6437a8da58eb48bcee73d4a4a5f22671d117b43 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -402,6 +402,7 @@ 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);
   // Call through CallFunctionStub with lazy deopt and frame-state.
   Node* CallFunctionStub0(Node* function, Node* receiver, Node* context,
                           Node* frame_state, CallFunctionFlags flags);