[llvm] [VPlan] Split out VPBlendRecipe simplifications from simplifyRecipes. NFC (PR #134073)

[Ramkumar Ramachandra via llvm-commits]

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@@ -1092,6 +1024,84 @@ void VPlanTransforms::simplifyRecipes(VPlan &Plan, Type &CanonicalIVTy) {
   }
 }
 
+void VPlanTransforms::simplifyBlends(VPlan &Plan) {
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artagnon wrote:

Sorry I missed this earlier, but it looks like simplifyBlends can be made static, and doesn't need to be added in the header?

https://github.com/llvm/llvm-project/pull/134073