[llvm] [SLP] Retune look-ahead scores for constants (PR #207548)

[Ryan Buchner via llvm-commits]

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@@ -2761,7 +2767,7 @@ class slpvectorizer::BoUpSLP {
       // Consider constants and buildvector compatible.
       if ((C1 && isa<InsertElementInst>(V2)) ||
           (C2 && isa<InsertElementInst>(V1)))
-        return LookAheadHeuristics::ScoreConstants;
+        return LookAheadHeuristics::ScoreSameOpcode;
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bababuck wrote:

Thanks for the explanations, makes more sense to me now.

https://github.com/llvm/llvm-project/pull/207548