[turbofan] Remove dead JSTypedLowering::EmptyFrameState.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2197163002
Cr-Commit-Position: refs/heads/master@{#38205}

src/compiler/js-typed-lowering.cc

@@ -2125,14 +2125,6 @@ Reduction JSTypedLowering::Reduce(Node* node) {
   return NoChange();
 }
 
-Node* JSTypedLowering::EmptyFrameState() {
-  return graph()->NewNode(
-      common()->FrameState(BailoutId::None(), OutputFrameStateCombine::Ignore(),
-                           nullptr),
-      jsgraph()->EmptyStateValues(), jsgraph()->EmptyStateValues(),
-      jsgraph()->EmptyStateValues(), jsgraph()->NoContextConstant(),
-      jsgraph()->UndefinedConstant(), graph()->start());
-}
 
 Factory* JSTypedLowering::factory() const { return jsgraph()->factory(); }
 

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_; }