Merge changes from topic \'rr_barrier\' am: e835f3a

am: 5cf09ba

* commit '5cf09ba6aba1d456ecc5b47085616914c490c708':
  Store precice set of which constructors require barriers
  Revert "Revert "Check if we require barrier if we did not resolve classes""
  Revert "Revert "Change RequiresConstructorBarrier default to yes""

Change-Id: I0eac446a8b1b712fb3678d87d1be4b07aba7fffe