[llvm] [VPlan] Implement interleaving as VPlan-to-VPlan transform. (PR #95842)

[Florian Hahn via llvm-commits]

================
@@ -603,6 +602,13 @@ bool VPInstruction::isVectorToScalar() const {
          getOpcode() == VPInstruction::ComputeReductionResult;
 }
 
+unsigned VPInstruction::getInterleaveCount() const {
+  return getNumOperands() == 1
----------------
fhahn wrote:

added assert, thanks!

https://github.com/llvm/llvm-project/pull/95842