Aligned allocation versus CUDA: make deallocation function preference order

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.

llvm-svn: 283830

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