[turbofan] Remove the EmptyFrameState caching on JSGraph.

src/compiler/js-graph.h

Index: src/compiler/js-graph.h
diff --git a/src/compiler/js-graph.h b/src/compiler/js-graph.h
index 3dacc35e3cbdaec74701b6319f86737a947f7f2c..a13d018373e41c6068b7e549f24dba6dbcbfbbdf 100644
--- a/src/compiler/js-graph.h
+++ b/src/compiler/js-graph.h
@@ -123,10 +123,6 @@ class JSGraph : public ZoneObject {
   // stubs and runtime functions that do not require a context.
   Node* NoContextConstant() { return ZeroConstant(); }
 
-  // Creates an empty frame states for cases where we know that a function
-  // cannot deopt.
-  Node* EmptyFrameState();
-
   // Creates an empty StateValues node, used when we don't have any concrete
   // values for a certain part of the frame state.
   Node* EmptyStateValues();
@@ -162,7 +158,6 @@ class JSGraph : public ZoneObject {
     kZeroConstant,
     kOneConstant,
     kNaNConstant,
-    kEmptyFrameState,
     kEmptyStateValues,
     kDead,
     kNumCachedNodes  // Must remain last.