[llvm] [NFC][LLVM] Remove unused `TargetIntrinsicInfo` class (PR #111762)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm approved this pull request.

Someone may eventually want to bring this back. Occasionally there's a push to avoid building all the intrinsics for unbuilt targets, but there hasn't been much movement on that recently 

https://github.com/llvm/llvm-project/pull/111762