[clang] [clang] Add lifetimebound attr to std::span/std::string_view constructor (PR #103716)

[Nikita Popov via cfe-commits]

nikic wrote:

Just as a FYI this inference introduces a small amount of overhead: http://llvm-compile-time-tracker.com/compare.php?from=866bec7d3ff8803b68e9972939c1a76ccf5fdc62&to=902b2a26ab9e1e78dfb66b52fba4512c91472e09&stat=instructions:u

https://github.com/llvm/llvm-project/pull/103716