Migrate from std::pointer_to_unary_function as it is removed in C++17
Migrate from std::pointer_to_unary_function as it is removed in C++17

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@331097 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld