Minor. Add isComputing to DeferredType

compiler/frontend/src/org/jetbrains/kotlin/types/DeferredType.java

@@ -77,6 +77,10 @@ public class DeferredType extends DelegatingType implements LazyType {
         this.lazyValue = lazyValue;
     }
 
+    public boolean isComputing() {
+        return lazyValue.isComputing();
+    }
+
     public boolean isComputed() {
         return lazyValue.isComputed();
     }

core/util.runtime/src/org/jetbrains/kotlin/storage/LockBasedStorageManager.java

@@ -286,6 +286,11 @@ public class LockBasedStorageManager implements StorageManager {
             return value != NotValue.NOT_COMPUTED && value != NotValue.COMPUTING;
         }
 
+        @Override
+        public boolean isComputing() {
+            return value == NotValue.COMPUTING;
+        }
+
         @Override
         public T invoke() {
             Object _value = value;

core/util.runtime/src/org/jetbrains/kotlin/storage/storage.kt

@@ -28,10 +28,12 @@ public interface MemoizedFunctionToNullable<P, R : Any> : Function1<P, R?> {
 
 public interface NotNullLazyValue<T : Any> : Function0<T> {
     public fun isComputed(): Boolean
+    public fun isComputing(): Boolean
 }
 
 public interface NullableLazyValue<T : Any> : Function0<T?> {
     public fun isComputed(): Boolean
+    public fun isComputing(): Boolean
 }
 
 public operator fun <T : Any> NotNullLazyValue<T>.getValue(_this: Any?, p: KProperty<*>): T = invoke()