[turbofan] Remove support for --turbo-types.

src/compiler/js-generic-lowering.h

Index: src/compiler/js-generic-lowering.h
diff --git a/src/compiler/js-generic-lowering.h b/src/compiler/js-generic-lowering.h
index 5ee759bcc8c458cfe8244a2979d74d6090833661..a15777272791c47344d842de0fb02423be56ade6 100644
--- a/src/compiler/js-generic-lowering.h
+++ b/src/compiler/js-generic-lowering.h
@@ -24,7 +24,7 @@ class Linkage;
 // Lowers JS-level operators to runtime and IC calls in the "generic" case.
 class JSGenericLowering final : public Reducer {
  public:
-  JSGenericLowering(bool is_typing_enabled, JSGraph* jsgraph);
+  explicit JSGenericLowering(JSGraph* jsgraph);
   ~JSGenericLowering() final;
 
   Reduction Reduce(Node* node) final;
@@ -47,7 +47,6 @@ class JSGenericLowering final : public Reducer {
   MachineOperatorBuilder* machine() const;
 
  private:
-  bool const is_typing_enabled_;
   JSGraph* const jsgraph_;
 };