[clang] [CIR] Upstream support for address of and dereference (PR #134317)

[Andy Kaylor via cfe-commits]

andykaylor wrote:

I'm starting to be uncomfortable with the amount of alignment and LValueBaseInfo support we've skipped over. I tried to add markers in this PR where I wasn't adding support for those. I intend to fill in that support in a separate PR soon.

https://github.com/llvm/llvm-project/pull/134317