[llvm] [NFC][LLVM] Remove unused `TargetIntrinsicInfo` class (PR #126003)

[Nikita Popov via llvm-commits]

nikic wrote:

For reference, this was introduced in https://github.com/llvm/llvm-project/commit/6ae3aa83d0383dd86f5e54db3d4930a4e6fe0712.

> > Can we remove this immediately or do we need to deprecate it for a release cycle? Either way it needs to be documented in the llvm Release Notes
> 
> I am not sure if there are any downstream users. I'll update release notes and post on the forum as well. @nikic is that sufficient, or should we follow more rigor here (i.e, deprecate it in some way) and delete in later?

I think that's fine. There's no need to deprecate unless the API is widely used, which does not seem to be the case here.

https://github.com/llvm/llvm-project/pull/126003