[llvm] [GlobalISel] Combine [S,U]SUBO (PR #116489)

[Thorsten Schütt via llvm-commits]

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@@ -1901,6 +1907,13 @@ def cmp_combines: GICombineGroup<[
   redundant_binop_in_equality
 ]>;
 
+
+def artifact_combines: GICombineGroup<[
+  merge_combines,
+  match_addos,
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tschuett wrote:

Ok, I need a mechanism to combine addos in AArch64PostLegalizerCombiner and I want to have a group where I/we can add more combines that run in the post legalizer  combiner. It is sufficient to rename `artifact_combines` to something like `post_legalizer_combines` ?

https://github.com/llvm/llvm-project/pull/116489