Fix linkage calculation of auto member functions returning lambdas
As described by Richard in https://groups.google.com/a/isocpp.org/d/msg/std-discussion/S1kmj0wF5-g/fb6agEYoL2IJ we should allow: template<typename S> struct A { template<typename T> static auto default_lambda() { return [](const T&) { return 42; }; } template<class U = decltype(default_lambda<S>())> U func(U u = default_lambda<S>()) { return u; } }; int run2 = A<double>{}.func()(3.14); int run3 = A<char>{}.func()('a'); This patch allows the code using the same trickery that was used to allow the code in non-member functions at namespace scope. Please see http://llvm-reviews.chandlerc.com/D1844 for richard's approval. llvm-svn: 192166
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