match other CUDA preference orders, per discussion with jlebar. We now model
this in an attempt to match overload resolution as closely as possible:

- First, we throw out all non-callable (due to CUDA host/device mismatch)
  operator delete functions.
- Then we apply sizedness / alignedness preferences based on whether the type
  is overaligned and whether the deallocation function is a member.
- Finally, we use the CUDA callability preference as a tiebreaker.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@283830 91177308-0d34-0410-b5e6-96231b3b80d8