Stop exporting symbols in anonymous namespaces (#62952)
Summary:
The cases are found out by compiling against clang on Windows.
Those functions will still be exported under this case, which is a waste of space in the symbol table.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62952
Reviewed By: gchanan
Differential Revision: D30191291
Pulled By: ezyang
fbshipit-source-id: 3319b0ec4f5fb02e0fe1b81dbbcedcf12a0c795e
