[llvm] [AMDGPU] SelectionDAG divergence tracking should take into account Target divergency. (PR #144947)

[via llvm-commits]

alex-t wrote:

> Needs a test?

I would like to have a test for that but, honestly, I still have no idea how it could look like. For that, I could set the workgroup size to 1 — if only I knew how to check whether the particular code (updateDivergence()) is being executed.

https://github.com/llvm/llvm-project/pull/144947