[libcxx-commits] [libcxx] [libc++][NFC] Update <any> to a more modern code style (PR #174619)

[Alexander Kornienko via libcxx-commits]

alexfh wrote:

> This boils down to the following (https://gcc.godbolt.org/z/oTfWdGvnd):
> 
> ```
> #include <any>
> 
> struct Foo {
>   Foo(std::any v);
> };
> 
> template <typename T, bool = std::is_copy_constructible<T>::value>
> void f(T) {}
> 
> void q(Foo x) { f(x); }
> ```

Filed https://github.com/llvm/llvm-project/issues/176877

https://github.com/llvm/llvm-project/pull/174619