[libcxx-commits] [libcxx] [libc++] Fix UB in <expected> related to "has value" flag (#68552) (PR #68733)

[Louis Dionne via libcxx-commits]

ldionne wrote:

> @ldionne This looks like a case where we want to have an optimized test run - especially, since none of the static analyzers or sanitizers caught this.

See #68753.

https://github.com/llvm/llvm-project/pull/68733