[llvm] [SandboxVectorizer] Add MemSeed bundle types (PR #111584)

[via llvm-commits]

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@@ -123,5 +123,35 @@ class SeedBundle {
   }
 #endif // NDEBUG
 };
+
+template <typename LoadOrStoreT> class MemSeedBundle : public SeedBundle {
+public:
+  explicit MemSeedBundle(SmallVector<Instruction *> &&SV, ScalarEvolution &SE)
+      : SeedBundle(std::move(SV)) {
+    assert(all_of(Seeds, [](auto *S) { return isa<LoadOrStoreT>(S); }) &&
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vporpo wrote:

Perhaps a static assert?
```
static_assert(std::is_same<LoadOrStoreT, LoadInst>::value || std::is_same<LoadOrStoreT, StoreInst>::value, "Expected LoadInst or StoreInst!");
```

https://github.com/llvm/llvm-project/pull/111584