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

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> 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

@jurahul Would focusing on stripping unused target intrinsics be a better approach if you're trying to save codesize? I'm assuming this PR is part of your compression proposal?

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