llvm-project

482bb3d1 - [SandboxVec][DAG] Mark UnscheduledSuccs as invalid when vectorized (#185519)

[SandboxVec][DAG] Mark UnscheduledSuccs as invalid when vectorized (#185519) When a DAG node gets scheduled, it's UnscheduledSuccs variable becomes invalid. Up until now we had no way in the code of expressing this. This patch converts UnscheduledSuccs to an std::optional in order to protect its use when not valid.