[llvm] [BasicAA] Treat returns_twice functions as clobbering unescaped objects (PR #117902)

[Nikita Popov via llvm-commits]

nikic wrote:

Possibly. Note that callCapturesBefore() is mostly obsolete and only used by one place in MemCpyOpt at this point, so it likely doesn't make a difference in practice.

https://github.com/llvm/llvm-project/pull/117902