[llvm] [AMDGPU][SIPreEmitPeephole] mustRetainExeczBranch: use BranchProbability and TargetSchedmodel (PR #109818)

[Juan Manuel Martinez Caamaño via llvm-commits]

jmmartinez wrote:

Not to self: 

Remove the `skip-threshold` flag from the tests where the default target is not specified:
* insert-skips-gws.mir
* insert-skips-gfx10.mir
* insert-skips-gfx12.mir
* remove-short-exec-branches-gpr-idx-mode.mir
* maybe insert-skips-flat-vmem-ds.mir ?
* remove-short-exec-branches-special-instructions.mir

https://github.com/llvm/llvm-project/pull/109818