[llvm] [FuncSpec] Update function specialization to handle phi-chains (PR #71442)

[Momchil Velikov via llvm-commits]

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@@ -262,30 +267,86 @@ Cost InstCostVisitor::estimateBranchInst(BranchInst &I) {
   return estimateBasicBlocks(WorkList);
 }
 
+void InstCostVisitor::discoverStronglyConnectedComponent(PHINode *PN,
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momchil-velikov wrote:

Would be nice to get some description of the algorithm. I've never seen such an algorithm for SCC and I'm not at all convinced it does what it says on the tin.

https://github.com/llvm/llvm-project/pull/71442