[turbofan] Remove dead JSTypedLowering::EmptyFrameState.

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index 123fd99decaefcf6e319c49d478ffe02021355d8..b5c1b869b47944d832a88c8988676759bfcc93de 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -89,8 +89,6 @@ class JSTypedLowering final : public AdvancedReducer {
   Reduction ReduceUI32Shift(Node* node, Signedness left_signedness,
                             const Operator* shift_op);
 
-  Node* EmptyFrameState();
-
   Factory* factory() const;
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }