Apply Active Record suppression to all saves

It was not being applied to creates and updates attempted through the
non-bang save methods. This means that, for example, creation of
records for singular associations through the `create_*` methods was
not appropriately ignored in .suppress blocks.

activerecord/lib/active_record/suppressor.rb

@@ -37,8 +37,7 @@ def suppress(&block)
       end
     end
 
-    # Ignore saving events if we're in suppression mode.
-    def save!(*args) # :nodoc:
+    def create_or_update(*args) # :nodoc:
       SuppressorRegistry.suppressed[self.class.name] ? true : super
     end
   end

activerecord/test/cases/suppressor_test.rb

@@ -3,7 +3,38 @@
 require 'models/user'
 
 class SuppressorTest < ActiveRecord::TestCase
-  def test_suppresses_creation_of_record_generated_by_callback
+  def test_suppresses_create
+    assert_no_difference -> { Notification.count } do
+      Notification.suppress do
+        Notification.create
+        Notification.create!
+        Notification.new.save
+        Notification.new.save!
+      end
+    end
+  end
+
+  def test_suppresses_update
+    user = User.create! token: 'asdf'
+
+    User.suppress do
+      user.update token: 'ghjkl'
+      assert_equal 'asdf', user.reload.token
+
+      user.update! token: 'zxcvbnm'
+      assert_equal 'asdf', user.reload.token
+
+      user.token = 'qwerty'
+      user.save
+      assert_equal 'asdf', user.reload.token
+
+      user.token = 'uiop'
+      user.save!
+      assert_equal 'asdf', user.reload.token
+    end
+  end
+
+  def test_suppresses_create_in_callback
     assert_difference -> { User.count } do
       assert_no_difference -> { Notification.count } do
         Notification.suppress { UserWithNotification.create! }