[llvm] [LV] Use wide lane masks as the canonical form when tail-folding & interleaving (PR #209484)

[David Sherwood via llvm-commits]

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@@ -2096,9 +1997,15 @@ static bool simplifyBranchConditionForVFAndUF(VPlan &Plan, ElementCount BestVF,
                       m_CombineOr(m_CanIVInc, m_c_Add(m_CanIVInc, m_LiveIn())),
                       m_VPValue())) ||
       match(Term, m_BranchOnCond(m_Not(m_ActiveLaneMask(
-                      m_VPValue(), m_VPValue(), m_VPValue()))))) {
+                      m_VPValue(), m_VPValue(), m_VPValue())))) ||
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david-arm wrote:

Is this match for ActiveLaneMask still needed?

https://github.com/llvm/llvm-project/pull/209484