[llvm] [ctx_prof] Fix `ProfileAnnotator::allTakenPathsExit` (PR #109183)

[Teresa Johnson via llvm-commits]

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@@ -233,28 +233,37 @@ class ProfileAnnotator final {
     std::deque<const BasicBlock *> Worklist;
     DenseSet<const BasicBlock *> Visited;
     Worklist.push_back(&F.getEntryBlock());
-    Visited.insert(&F.getEntryBlock());
+    bool HitExit = false;
     while (!Worklist.empty()) {
       const auto *BB = Worklist.front();
       Worklist.pop_front();
-      if (succ_size(BB) <= 1)
+      if (!Visited.insert(BB).second)
         continue;
+      if (succ_size(BB) == 0) {
+        if (isa<UnreachableInst>(BB->getTerminator()))
+          return false;
+        HitExit = true;
+        continue;
+      }
+      if (succ_size(BB) == 1) {
+        llvm::append_range(Worklist, successors(BB));
+        continue;
+      }
       const auto &BBInfo = getBBInfo(*BB);
-      bool Inserted = false;
+      bool HasAWayOut = false;
       for (auto I = 0U; I < BB->getTerminator()->getNumSuccessors(); ++I) {
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teresajohnson wrote:

can this use succ_size as used above, for consistency? And maybe call that once and save the result.

https://github.com/llvm/llvm-project/pull/109183