Make Reference::iset_throw work with multiple-inheritance interfaces
Make Reference::iset_throw work with multiple-inheritance interfaces

Change-Id: Ia8a644c613de17279abdab533a6314ba6c0e0aec

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core