[PATCH] D29877: Warn about unused static file scope function template declarations.

[Vassil Vassilev via Phabricator via cfe-commits]

v.g.vassilev added a comment.

Reverted in r299956, due to failures like:

  template <class _Up> static int __test(...);
  
  template<typename _Tp>
  auto v = __test<_Tp>(0);


https://reviews.llvm.org/D29877