[llvm] [AMDGPU] Add `isConvergent=1` to `DS_ATOMIC_*_BARRIER` instructions (PR #214166)

[Pierre van Houtryve via llvm-commits]

Pierre-vh wrote:

> Please do pre-commit the test.

Can I commit it straight away ? With GitHub I unfortunately cannot change the target branch of this PR to create a stack :/

https://github.com/llvm/llvm-project/pull/214166