[llvm] [LoopPeel] Added support for cases where PhiAnalyzer contains Induction PHI (PR #94900)

[Moriyuki Saito via llvm-commits]

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@@ -217,33 +218,39 @@ PhiAnalyzer::PeelCounter PhiAnalyzer::calculate(const Value &V) {
   if (L.isLoopInvariant(&V))
     // Loop invariant so known at start.
     return (IterationsToInvariance[&V] = 0);
-  if (const PHINode *Phi = dyn_cast<PHINode>(&V)) {
+  if (PHINode *Phi = dyn_cast<PHINode>(&V)) {
     if (Phi->getParent() != L.getHeader()) {
       // Phi is not in header block so Unknown.
       assert(IterationsToInvariance[&V] == Unknown && "unexpected value saved");
       return Unknown;
     }
+
+    // If Induction PHI, register as a starting point.
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m-sai wrote:

@madhur13490  Thanks for your comment. 
Comment added. How about something like this?

https://github.com/llvm/llvm-project/pull/94900