[llvm] [CodeGen] Add getTgtMemIntrinsic overload for multiple memory operands (NFC) (PR #175843)

[Krzysztof Drewniak via llvm-commits]

https://github.com/krzysz00 commented:

Minor notes, seems reasonable but this isn't code I inhabit often - I'm willing to stamp this if it languishes

https://github.com/llvm/llvm-project/pull/175843