[K/N] Avoid inlining of ignored check on external call

kotlin-native/runtime/src/main/cpp/Mutex.hpp

@@ -36,20 +36,23 @@ class SpinLock;
 template <>
 class SpinLock<MutexThreadStateHandling::kIgnore> : private Pinned {
 public:
-    // No need to check for external calls, because we explicitly ignore thread state.
-    NO_EXTERNAL_CALLS_CHECK void lock() noexcept {
+    void lock() noexcept {
         while(flag_.test_and_set(std::memory_order_acquire)) {
-            std::this_thread::yield();
+            yield();
         }
     }
 
-    // No need to check for external calls, because we explicitly ignore thread state.
-    NO_EXTERNAL_CALLS_CHECK void unlock() noexcept {
+    void unlock() noexcept {
         flag_.clear(std::memory_order_release);
     }
 
 private:
     std::atomic_flag flag_ = ATOMIC_FLAG_INIT;
+
+    // No need to check for external calls, because we explicitly ignore thread state.
+    static NO_EXTERNAL_CALLS_CHECK NO_INLINE void yield() {
+        std::this_thread::yield();
+    }
 };
 
 template <>