[llvm] [VPlan] Simplify add x, (sub 0, y) -> sub x, y (PR #187228)

[Ramkumar Ramachandra via llvm-commits]

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@@ -1452,14 +1452,26 @@ static void simplifyRecipe(VPSingleDefRecipe *Def, VPTypeAnalysis &TypeInfo) {
         Plan->getZero(TypeInfo.inferScalarType(Def)));
 
   if (CanCreateNewRecipe && match(Def, m_c_Mul(m_VPValue(A), m_AllOnes()))) {
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artagnon wrote:

Just forgot to push after rebase -- note that wrap-flags regress in some cases, and https://github.com/llvm/llvm-project/pull/187710 would fix it.

https://github.com/llvm/llvm-project/pull/187228