[K/N][New MM] Fix getting current thread data in thread suspension

kotlin-native/runtime/src/mm/cpp/ThreadSuspension.cpp

@@ -22,7 +22,9 @@ bool isSuspendedOrNative(kotlin::mm::ThreadData& thread) noexcept {
 template<typename F>
 bool allThreads(F predicate) noexcept {
     auto& threadRegistry = kotlin::mm::ThreadRegistry::Instance();
-    auto* currentThread = threadRegistry.CurrentThreadData();
+    auto* currentThread = (threadRegistry.IsCurrentThreadRegistered())
+            ? threadRegistry.CurrentThreadData()
+            : nullptr;
     kotlin::mm::ThreadRegistry::Iterable threads = kotlin::mm::ThreadRegistry::Instance().LockForIter();
     for (auto& thread : threads) {
         // Handle if suspension was initiated by the mutator thread.