[llvm] [VPlan] Compute blend masks from minimum set of edge masks (PR #201783)

[Florian Hahn via llvm-commits]

================
@@ -67,5 +68,11 @@ template <>
 struct GraphTraits<const VPDomTreeNode *>
     : public DomTreeGraphTraitsBase<const VPDomTreeNode,
                                     VPDomTreeNode::const_iterator> {};
+
+class VPPostDominanceFrontier
+    : public DominanceFrontierBase<VPBlockBase, true> {
+public:
----------------
fhahn wrote:

nit: could this just be a `struct`?
```suggestion
struct VPPostDominanceFrontier
    : public DominanceFrontierBase<VPBlockBase, true> {
```

https://github.com/llvm/llvm-project/pull/201783