[llvm] [SandboxVectorizer] Add container class to track and manage SeedBundles (PR #112048)

[Ramkumar Ramachandra via llvm-commits]

================
@@ -54,6 +54,10 @@ class SeedBundle {
     NumUnusedBits += Utils::getNumBits(I);
   }
 
+  virtual void insert(Instruction *I, ScalarEvolution &SE) {
+    assert("Subclasses must override this function.");
+  }
+
----------------
artagnon wrote:

`= 0`?

https://github.com/llvm/llvm-project/pull/112048