David Majnemer 763584dc64 MS ABI: Tweak pointer-to-member mangling/inheritance model selection ...

Properly determine the inheritance model when dealing with nullptr:
- If a nullptr template argument is being checked against
  pointer-to-member parameter, nail down an inheritance model.
  N.B. We will chose an inheritance model even if we won't ultimately
  choose the template to instantiate!  Cooky, right?
- Null pointer-to-datamembers have a virtual base table offset of -1,
  not zero. Previously, we chose an offset of 0.

llvm-svn: 200920

2014-02-06 10:59:19 +00:00

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