[clang] [clang codegen][NFC] Delete dead code in constant emission. (PR #90106)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

Oh, I was confused that we had this code that doesn't appear to be doing anything.  If you actually have a plan, then we can keep it for now, I guess.

It might make sense to try to clarify some of the address-space related APIs: if the caller doesn't want placeholder-stuff, it shouldn't be forced to pass in an address-space, I think.  But if the relevant code is going to be upstream, we can wait to discuss it on the relevant PRs.

https://github.com/llvm/llvm-project/pull/90106