Reid Kleckner ad1e22bf33 Re-land "[MS] Don't expect vftables to be provided for extern template instantiations" ...

Reverts r273305 and re-instates r273296.

We needed to fix a bug in Sema::MarkVTableUsed to ensure that operator
delete lookup occurs when the vtable is referenced. We already had a
special case to look up operator delete when dllimport was used, but I
think should really mark virtual destructors referenced any time the
vtable is used.

llvm-svn: 274147

2016-06-29 18:29:21 +00:00

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