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

[Rahul Joshi via llvm-commits]

jurahul wrote:

Resurrecting this old PR: https://github.com/llvm/llvm-project/pull/111762 given my earlier efforts to compile only intrinsics for enabled target did not succeed. I couldn't use that PR as it was stuck in github "Processing Updates" and seems the workaround is to just create a new PR.

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