[PATCH] D40144: Implement `std::launder`

[Hal Finkel via Phabricator via cfe-commits]

hfinkel added a comment.

In https://reviews.llvm.org/D40144#927828, @tcanens wrote:

> At least for GCC, it should use `__builtin_launder`.


I presume we'll need to add something similar for Clang as well.

> Also needs to implement "The program is ill-formed if `T` is a function type or //cv// `void`."




https://reviews.llvm.org/D40144