[llvm] [AMDGPU] Compiler should synthesize private buffer resource descriptor from flat_scratch_init (PR #79586)

[via llvm-commits]

alex-t wrote:

> We do need a follow up change to prune this from the calling convention lowering. It's going to cause a huge amount of test churn, so it should be done separately

So, could you please formalize the request a bit and possibly open the Jira ticket?
Just to clarify what exactly did you mean to prune: Rsrc23 constants "black magic" or... what?

https://github.com/llvm/llvm-project/pull/79586