[libcxx-commits] [libcxx] [libc++] Add benchmark for `std::exception_ptr` (PR #164278)

[Adrian Vogelsgesang via libcxx-commits]

vogelsgesang wrote:

> we can have small snippets which exercise the folds we expect. I'd actually drop some of the DoNotOptimize so we can show the constant folds. Then we don't need the exception_ptr_move_copy_swap I think.

After adding the `== nullptr` checks, I think we can get rid of the `exception_ptr_move_copy_swap` - see latest commit




https://github.com/llvm/llvm-project/pull/164278