[llvm] [SelectionDAG] Change computeAliasing signature from optional<uint64> to LocationSize. (PR #83017)

[David Green via llvm-commits]

davemgreen wrote:

Hi. Yeah that sounds good. I hadn't realized this came up in practice.

Did you want to create the ticket and whatnot?

https://github.com/llvm/llvm-project/pull/83017