[PATCH] Add some extra checks to the MoveOnly test class to ensure it is not constructed or assigned from in a moved-from state.

[Marshall Clow]

> I can go back & try to reproduce the particular valid cases that are buggy in SmallVector and non-buggy but untested in std::vector, if you'd like.

I would appreciate it; thanks.

And I apologize for taking so long on this that you forgot the context.

http://reviews.llvm.org/D4095