[llvm] [SLP] Allow targets to add cost for nonstandard conditions (PR #95328)

[Matt Arsenault via llvm-commits]

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@@ -891,6 +891,11 @@ class TargetTransformInfo {
                                            bool Insert, bool Extract,
                                            TTI::TargetCostKind CostKind) const;
 
+  /// Whether or not there is any target-specific condition that imposes an
+  /// overhead for scalarization
+  bool hasScalarizationOverhead(ArrayRef<Value *> VL,
+                                std::pair<bool, bool> &ScalarizationKind) const;
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arsenm wrote:

What can this express that getOperandsScalarizationOverhead and getScalarizationOverhead do not? 

I'm already confused by every function in TTI having multiple versions of ~everything

https://github.com/llvm/llvm-project/pull/95328