[llvm] [GlobalIsel] Combine G_EXTRACT_VECTOR_ELT (PR #85321)

[Matt Arsenault via llvm-commits]

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@@ -4100,6 +4100,14 @@ void CombinerHelper::applyBuildFn(
   MI.eraseFromParent();
 }
 
+void CombinerHelper::applyBuildFnMO(const MachineOperand &MO,
+                                    BuildFnTy &MatchInfo) {
+  MachineInstr *Root = getDefIgnoringCopies(MO.getReg(), MRI);
+  Builder.setInstrAndDebugLoc(*Root);
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arsenm wrote:

Setting the insert point should now be unnecessary in apply functions 

https://github.com/llvm/llvm-project/pull/85321