[llvm] [ValueTracking] NFC: Allow tracking values through AddrSpaceCasts (PR #70483)

[Nikita Popov via llvm-commits]

nikic wrote:

(Hard reject on TTI dependency in ValueTracking. You can solve this either via changes to LangRef, or by encoding necessary information in DataLayout.)

https://github.com/llvm/llvm-project/pull/70483