PR22763: if a defaulted (non-user-provided) special member function is

explicitly instantiated, still emit it with each use.

We don't emit a definition of the member with an explicit instantiation
definition (and indeed it appears that we're not allowed to, since an explicit
instantiation definition does not constitute an odr-use and only odr-use
permits definition for defaulted special members). So we still need to emit a
weak definition with each use.

This also makes defaulted-in-class declarations behave more like
implicitly-declared special members, which matches their design intent.
And it matches the way this problem was solved in GCC.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@318474 91177308-0d34-0410-b5e6-96231b3b80d8