[turbofan] Allow deoptimization for JSToNumber operator.

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 040a745e3cfd553a7796f36846197084c46db7f2..2f5ebd9ce9cd66ee6569d6a2ca3e45cb76ba514f 100644
--- a/src/compiler/js-graph.h
+++ b/src/compiler/js-graph.h
@@ -109,6 +109,10 @@ 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();
+
   JSOperatorBuilder* javascript() { return javascript_; }
   CommonOperatorBuilder* common() { return common_; }
   MachineOperatorBuilder* machine() { return machine_; }
@@ -135,6 +139,7 @@ class JSGraph : public ZoneObject {
   SetOncePointer<Node> zero_constant_;
   SetOncePointer<Node> one_constant_;
   SetOncePointer<Node> nan_constant_;
+  SetOncePointer<Node> empty_frame_state_;
 
   CommonNodeCache cache_;