MS ABI: The latest VC "14" CTP implements deleted virtual functions
Deleted virtual functions get _purecall inserted into the vftable.
Earlier CTPs would simply stick nullptr in there.
N.B. MSVC can't handle deleted virtual functions which require return
adjusting thunks, they give an error that a deleted function couldn't be
called inside of a compiler generated function. We get this correct by
making the thunk have a __purecall entry as well.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@217654
91177308-0d34-0410-b5e6-
96231b3b80d8
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