Refactor `attributes_for_{create,update}` to avoid an extra allocation

Use `delete_if` instead of `reject` to avoid an extra allocation.

activerecord/lib/active_record/attribute_methods.rb

@@ -459,7 +459,8 @@ def attributes_with_values(attribute_names)
 
       # Filters the primary keys and readonly attributes from the attribute names.
       def attributes_for_update(attribute_names)
-        attribute_names.reject do |name|
+        attribute_names &= self.class.column_names
+        attribute_names.delete_if do |name|
           readonly_attribute?(name)
         end
       end
@@ -467,7 +468,8 @@ def attributes_for_update(attribute_names)
       # Filters out the primary keys, from the attribute names, when the primary
       # key is to be generated (e.g. the id attribute has no value).
       def attributes_for_create(attribute_names)
-        attribute_names.reject do |name|
+        attribute_names &= self.class.column_names
+        attribute_names.delete_if do |name|
           pk_attribute?(name) && id.nil?
         end
       end

activerecord/lib/active_record/persistence.rb

@@ -718,7 +718,6 @@ def create_or_update(*args, &block)
     # Updates the associated record with values matching those of the instance attributes.
     # Returns the number of affected rows.
     def _update_record(attribute_names = self.attribute_names)
-      attribute_names &= self.class.column_names
       attribute_names = attributes_for_update(attribute_names)
 
       if attribute_names.empty?
@@ -737,7 +736,6 @@ def _update_record(attribute_names = self.attribute_names)
     # Creates a record with values matching those of the instance attributes
     # and returns its id.
     def _create_record(attribute_names = self.attribute_names)
-      attribute_names &= self.class.column_names
       attribute_names = attributes_for_create(attribute_names)
 
       new_id = self.class._insert_record(