Fix some GCC warnings by providing a virtual destructor in the base of a class hierarchy with virtual methods and using llvm_unreachable to properly indicate unreachable states which would otherwise leave variables uninitialized.
Fix some GCC warnings by providing a virtual destructor in the base of a class
hierarchy with virtual methods and using llvm_unreachable to properly indicate
unreachable states which would otherwise leave variables uninitialized.


git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@111803 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx