Make fully_qualified_type_name_impl() compatible with VS2017 15.9 (#31455)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31455
In 15.9, __FUNCSIG__ unwraps using definitions as well as preserves noexcept qualifiers
Test Plan: Build caffe2 on Windows using VS2017
Differential Revision: D19166204
fbshipit-source-id: b6c5f70e5262d13adf585f77b92223cf5f1e78dd
