[turbofan] Remove phase ordering problem in JSToNumber lowering.

src/compiler/simplified-lowering.h

Index: src/compiler/simplified-lowering.h
diff --git a/src/compiler/simplified-lowering.h b/src/compiler/simplified-lowering.h
index efb4f22c9206e95be11f2716849af278f27921b3..baffe206ff6a9a34ef8bfa37aa1d8dd2f2354164 100644
--- a/src/compiler/simplified-lowering.h
+++ b/src/compiler/simplified-lowering.h
@@ -21,6 +21,7 @@ namespace compiler {
 
 // Forward declarations.
 class RepresentationChanger;
+class RepresentationSelector;
 class SourcePositionTable;
 
 class SimplifiedLowering final {
@@ -31,6 +32,10 @@ class SimplifiedLowering final {
 
   void LowerAllNodes();
 
+  void DoJSToNumberTruncatesToFloat64(Node* node,
+                                      RepresentationSelector* selector);
+  void DoJSToNumberTruncatesToWord32(Node* node,
+                                     RepresentationSelector* selector);
   // TODO(turbofan): The representation can be removed once the result of the
   // representation analysis is stored in the node bounds.
   void DoLoadBuffer(Node* node, MachineRepresentation rep,
@@ -42,6 +47,8 @@ class SimplifiedLowering final {
   JSGraph* const jsgraph_;
   Zone* const zone_;
   TypeCache const& type_cache_;
+  SetOncePointer<Node> to_number_code_;
+  SetOncePointer<Operator const> to_number_operator_;
 
   // TODO(danno): SimplifiedLowering shouldn't know anything about the source
   // positions table, but must for now since there currently is no other way to
@@ -59,6 +66,9 @@ class SimplifiedLowering final {
   Node* Uint32Div(Node* const node);
   Node* Uint32Mod(Node* const node);
 
+  Node* ToNumberCode();
+  Operator const* ToNumberOperator();
+
   friend class RepresentationSelector;
 
   Isolate* isolate() { return jsgraph_->isolate(); }
@@ -67,6 +77,7 @@ class SimplifiedLowering final {
   Graph* graph() { return jsgraph()->graph(); }
   CommonOperatorBuilder* common() { return jsgraph()->common(); }
   MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
+  SimplifiedOperatorBuilder* simplified() { return jsgraph()->simplified(); }
 };
 
 }  // namespace compiler