[llvm] [GlobalIsel] Combine G_UNMERGE_VALUES from opaque vectors into scalars (PR #113040)

[Matt Arsenault via llvm-commits]

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@@ -7611,85 +7611,3 @@ bool CombinerHelper::matchFoldAMinusC1PlusC2(const MachineInstr &MI,
 
   return true;
 }
-
-bool CombinerHelper::matchUnmergeValuesAnyExtBuildVector(const MachineInstr &MI,
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arsenm wrote:

It would be easier to review if the diff was local to the file, and this code wasn't moved to another file 

https://github.com/llvm/llvm-project/pull/113040