[llvm-branch-commits] [llvm] [SSAUpdaterBulk] Add PHI simplification pass. (PR #135180)

[Matt Arsenault via llvm-branch-commits]

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@@ -77,6 +76,10 @@ class SSAUpdaterBulk {
   /// vector.
   void RewriteAllUses(DominatorTree *DT,
                       SmallVectorImpl<PHINode *> *InsertedPHIs = nullptr);
+
+  /// Rewrite all uses and simplify the inserted PHI nodes.
+  /// Use this method to preserve behavior when replacing SSAUpdater.
+  void RewriteAndOptimizeAllUses(DominatorTree *DT);
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arsenm wrote:

Should this be a reference? Is null really permitted? 

https://github.com/llvm/llvm-project/pull/135180