[ThreadPool] delete debug global variable if not needed

https://lab.llvm.org/buildbot/#/builders/5/builds/23099

diff --git a/llvm/lib/Support/ThreadPool.cpp b/llvm/lib/Support/ThreadPool.cpp
index bb566eb..31461e3 100644 (file)
--- a/llvm/lib/Support/ThreadPool.cpp
+++ b/llvm/lib/Support/ThreadPool.cpp
@@ -100,6 +100,10 @@ void ThreadPool::processTasks(ThreadPoolTaskGroup *WaitingForGroup) {
 
 #ifndef NDEBUG
     CurrentThreadTaskGroups->pop_back();
+    if (CurrentThreadTaskGroups->empty()) {
+      delete CurrentThreadTaskGroups;
+      CurrentThreadTaskGroups = nullptr;
+    }
 #endif
 
     bool Notify;