[llvm] [TTI] Add getPointerInfos/getPointerInfo query for target address spaces (PR #213311)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

I don't think we should be trying to give naming significance to address spaces. This is ultimately a 24-bit value, and I don't see the point of returning a string name (especially as part of a TTI interface)

https://github.com/llvm/llvm-project/pull/213311