[llvm] [LLVM] Change Intrinsic::ID to encode target and intrinsic index (PR #113576)

[Jay Foad via llvm-commits]

jayfoad wrote:

> This change is in preparation for being able to disable intrinsics for targets that are not enabled.

Why is it required for that? Is there some requirement that LLVM builds with different targets enabled use the same IDs?

https://github.com/llvm/llvm-project/pull/113576