[llvm-branch-commits] [llvm] [LTT] Add `unknown` branch weights when lowering type tests with conditional (PR #170752)

[Peter Collingbourne via llvm-branch-commits]

pcc wrote:

> > The frontend is expected to add unlikely annotations and we don't want this function to override them.
> 
> To the function itself? I don't see how the frontend could add unlikely annotations to a synthetic branch constructed by this pass.

Ah, this is the case where the intrinsic isn't used by a conditional branch. Since that case is not expected to occur frequently in practice, it's fine to put anything we want on this branch.

https://github.com/llvm/llvm-project/pull/170752