[llvm] [AMDGPU][AMDGPUDemoteSCCBranchToExecz] demote s_cbranch_scc0/1 branches into vcmp + s_cbranch_execz branches (PR #110284)

[Juan Manuel Martinez Caamaño via llvm-commits]

jmmartinez wrote:

I'm closing this proposal since the already merged PRs are enough to handle CK's test case. The reduced code in the ticket had an scc branch, but CK didn't; so no there is no need to demote the scc branch in the end.

I'm going to rename the `amdgpu-demote-scc-branches.ll` test to `amdgpu-branch-weight-metadata.ll` or something like that, to better reflect what it is testing.

https://github.com/llvm/llvm-project/pull/110284