[turbofan] Remove obsolete parts of change lowering.

src/compiler/change-lowering.h

Index: src/compiler/change-lowering.h
diff --git a/src/compiler/change-lowering.h b/src/compiler/change-lowering.h
index ff3674f65eb0dba47e1327aff9a64e4d61ca3374..9535d05b487a301041d8dc1b3ad81eff113ef182 100644
--- a/src/compiler/change-lowering.h
+++ b/src/compiler/change-lowering.h
@@ -28,10 +28,8 @@ class ChangeLowering final : public Reducer {
 
  private:
   Node* HeapNumberValueIndexConstant();
-  Node* SmiMaxValueConstant();
   Node* SmiShiftBitsConstant();
 
-  Node* AllocateHeapNumberWithValue(Node* value, Node* control);
   Node* ChangeInt32ToFloat64(Node* value);
   Node* ChangeInt32ToSmi(Node* value);
   Node* ChangeSmiToFloat64(Node* value);
@@ -64,12 +62,7 @@ class ChangeLowering final : public Reducer {
   Node* LoadMapBitField(Node* map);
   Node* LoadMapInstanceType(Node* map);
 
-  Reduction ObjectIsCallable(Node* node);
-  Reduction ObjectIsNumber(Node* node);
-  Reduction ObjectIsReceiver(Node* node);
   Reduction ObjectIsSmi(Node* node);
-  Reduction ObjectIsString(Node* node);
-  Reduction ObjectIsUndetectable(Node* node);
 
   Node* ComputeIndex(const ElementAccess& access, Node* const key);
   Graph* graph() const;