[llvm] [NewPM][CodeGen] Port selection dag isel to new pass manager (PR #83567)

[Matt Arsenault via llvm-commits]

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@@ -361,7 +402,8 @@ SelectionDAGISel::~SelectionDAGISel() {
   delete SwiftError;
 }
 
-void SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const {
+void SelectionDAGISelLegacy::getAnalysisUsage(AnalysisUsage &AU) const {
+  const auto &OptLevel = Selector->OptLevel;
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arsenm wrote:

No reference? no auto? 

https://github.com/llvm/llvm-project/pull/83567