Refactor lexical home object binding

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index 63cd13d47c175ce5b934825df1d2ccb4163ea0ea..016fc7f7c3d852ccfd58ad68e6cd0d2f903eafb1 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -409,20 +409,12 @@ class Scope: public ZoneObject {
     return arguments_;
   }
 
-  // A local variable to the [[HomeObject]] used by methods if we need to
-  // allocate it; NULL otherwise.
-  Variable* home_object_var() const {
-    DCHECK(home_object_ == nullptr ||
-           (is_function_scope() && (IsConciseMethod(function_kind()) ||
-                                    IsAccessorFunction(function_kind()) ||
-                                    IsConstructor(function_kind()))));
-    return home_object_;
-  }
-
   Variable* this_function_var() const {
     // This is only used in derived constructors atm.
     DCHECK(this_function_ == nullptr ||
-           (is_function_scope() && IsSubclassConstructor(function_kind())));
+           (is_function_scope() && (IsConstructor(function_kind()) ||
+                                    IsConciseMethod(function_kind()) ||
+                                    IsAccessorFunction(function_kind()))));
     return this_function_;
   }
 
@@ -584,8 +576,6 @@ class Scope: public ZoneObject {
   Variable* new_target_;
   // Convenience variable; function scopes only.
   Variable* arguments_;
-  // Convenience variable; method scopes only.
-  Variable* home_object_;
   // Convenience variable; Subclass constructor only
   Variable* this_function_;
   // Module descriptor; module scopes only.