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

* commit 'e835f3a2e4a7af404e61a88058712f77737d87cd':
  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: Ib0083850b2870223c13e1aa3128f5f656de868e8