[llvm] [SandboxVec][DAG] Fix unscheduled succs when nodes are scheduled (PR #184946)

[via llvm-commits]

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@@ -537,12 +537,18 @@ void DependencyGraph::notifySetUse(const Use &U, Value *NewSrc) {
   // NewSrc if needed.
   if (auto *CurrSrcI = dyn_cast<Instruction>(U.get())) {
     if (auto *CurrSrcN = getNode(CurrSrcI)) {
-      CurrSrcN->decrUnscheduledSuccs();
+      // If CurrSrcN is scheduled there is no point in updating UnscheduleSuccs.
+      if (!CurrSrcN->scheduled()) {
+        CurrSrcN->decrUnscheduledSuccs();
+      }
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vporpo wrote:

Done

https://github.com/llvm/llvm-project/pull/184946