Revert renamed `GeneratedAttributeMethods`
Revert renamed `GeneratedAttributeMethods`

This partly reverts 8ca3c286a768038f6b391fd3bfbdfcc299876a1f.

`.is_a?(GeneratedAttributeMethodsBuilder)` doesn't make sense to me, the
module class's `new` creates just an instance of the module class itself.

jeremy/rails,yalab/rails,betesh/rails,MSP-Greg/rails,yhirano55/rails,fabianoleittes/rails,fabianoleittes/rails,flanger001/rails,rails/rails,shioyama/rails,eileencodes/rails,schuetzm/rails,Stellenticket/rails,repinel/rails,fabianoleittes/rails,tgxworld/rails,Vasfed/rails,georgeclaghorn/rails,schuetzm/rails,shioyama/rails,schuetzm/rails,yhirano55/rails,kddeisz/rails,shioyama/rails,prathamesh-sonpatki/rails,bogdanvlviv/rails,yawboakye/rails,Edouard-chin/rails,rafaelfranca/omg-rails,flanger001/rails,eileencodes/rails,iainbeeston/rails,yahonda/rails,rails/rails,Vasfed/rails,fabianoleittes/rails,lcreid/rails,Erol/rails,iainbeeston/rails,vipulnsward/rails,flanger001/rails,starknx/rails,rails/rails,eileencodes/rails,Vasfed/rails,flanger001/rails,Stellenticket/rails,yawboakye/rails,BlakeWilliams/rails,gauravtiwari/rails,Edouard-chin/rails,EmmaB/rails-1,lcreid/rails,kmcphillips/rails,prathamesh-sonpatki/rails,starknx/rails,yalab/rails,mechanicles/rails,Erol/rails,notapatch/rails,Edouard-chin/rails,bogdanvlviv/rails,mechanicles/rails,Erol/rails,Erol/rails,notapatch/rails,joonyou/rails,esparta/rails,kddeisz/rails,yhirano55/rails,vipulnsward/rails,palkan/rails,tjschuck/rails,eileencodes/rails,rafaelfranca/omg-rails,notapatch/rails,tgxworld/rails,kmcphillips/rails,prathamesh-sonpatki/rails,Stellenticket/rails,Vasfed/rails,shioyama/rails,Envek/rails,esparta/rails,kmcphillips/rails,joonyou/rails,MSP-Greg/rails,BlakeWilliams/rails,yalab/rails,Edouard-chin/rails,joonyou/rails,georgeclaghorn/rails,vipulnsward/rails,vipulnsward/rails,prathamesh-sonpatki/rails,betesh/rails,georgeclaghorn/rails,MSP-Greg/rails,yalab/rails,arunagw/rails,jeremy/rails,iainbeeston/rails,jeremy/rails,esparta/rails,betesh/rails,kddeisz/rails,Envek/rails,gauravtiwari/rails,tjschuck/rails,arunagw/rails,bogdanvlviv/rails,yahonda/rails,kddeisz/rails,palkan/rails,tgxworld/rails,rafaelfranca/omg-rails,joonyou/rails,tjschuck/rails,EmmaB/rails-1,EmmaB/rails-1,Stellenticket/rails,yhirano55/rails,tjschuck/rails,repinel/rails,yawboakye/rails,tgxworld/rails,lcreid/rails,rails/rails,mechanicles/rails,starknx/rails,kmcphillips/rails,yawboakye/rails,palkan/rails,repinel/rails,yahonda/rails,betesh/rails,arunagw/rails,mechanicles/rails,jeremy/rails,esparta/rails,repinel/rails,palkan/rails,BlakeWilliams/rails,Envek/rails,gauravtiwari/rails,bogdanvlviv/rails,BlakeWilliams/rails,yahonda/rails,MSP-Greg/rails,notapatch/rails,schuetzm/rails,lcreid/rails,arunagw/rails,Envek/rails,georgeclaghorn/rails,iainbeeston/rails