[llvm] [VPlan] Use subpattern-m_VPValue in simplifyRecipe (NFC) (PR #213268)

[Luke Lau via llvm-commits]

================
@@ -1598,18 +1598,17 @@ static void simplifyRecipe(VPSingleDefRecipe *Def) {
   //  Def = IVInc + Y
   // Fold the increment Y into the phi's start value, replace Def with IVInc,
   // and if Inc exists, replace it with X.
-  if (match(Def, m_Add(m_Add(m_VPValue(X), m_VPValue()), m_VPValue(Y))) &&
----------------
lukel97 wrote:

Might read clearer if we bind it to a dedicated `VPValue *IVInc;` instead of using Z, since the comments above reference IVInc

https://github.com/llvm/llvm-project/pull/213268