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

[via llvm-commits]

alex-t wrote:

> This breaks building some AArch64 related files. I've reverted it for now in [bfd4575](https://github.com/llvm/llvm-project/commit/bfd457588af9a7fa0aca14f14275d169c55e6277) to get things back to green, as a number of post-commit bots are failing. (pre-commit tests also seem to have failed with the build error)

My apologies for this mess :(

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