[llvm] [llvm][IR] Remove method IRBuilderBase::getInt8PtrTy (PR #74096)

[Youngsuk Kim via llvm-commits]

JOE1994 wrote:

> I think you can go ahead and remove the method directly.

Thank you. I pushed a follow-up commit that removes the method.

Is the `IRBuilderBase::getInt8PtrTy` method not exposed externally to clients?
Which methods can we delete without having to deprecate it first?

https://github.com/llvm/llvm-project/pull/74096