Use stubs in KtProperty for getDelegate() and getDelegateExpression()

compiler/psi/src/org/jetbrains/kotlin/psi/KtProperty.java

@@ -37,7 +37,7 @@ import java.util.Collections;
 import java.util.List;
 
 import static org.jetbrains.kotlin.KtNodeTypes.PROPERTY_DELEGATE;
-import static org.jetbrains.kotlin.lexer.KtTokens.*;
+import static org.jetbrains.kotlin.lexer.KtTokens.EQ;
 
 public class KtProperty extends KtTypeParameterListOwnerStub<KotlinPropertyStub>
         implements KtVariableDeclaration, PsiModifiableCodeBlock {
@@ -195,11 +195,17 @@ public class KtProperty extends KtTypeParameterListOwnerStub<KotlinPropertyStub>
         if (stub != null) {
             return stub.hasDelegate();
         }
+
         return getDelegate() != null;
     }
 
     @Nullable
     public KtPropertyDelegate getDelegate() {
+        KotlinPropertyStub stub = getStub();
+        if (stub != null && !stub.hasDelegate()) {
+            return null;
+        }
+
         return (KtPropertyDelegate) findChildByType(PROPERTY_DELEGATE);
     }
 
@@ -208,15 +214,22 @@ public class KtProperty extends KtTypeParameterListOwnerStub<KotlinPropertyStub>
         if (stub != null) {
             return stub.hasDelegateExpression();
         }
+
         return getDelegateExpression() != null;
     }
 
     @Nullable
     public KtExpression getDelegateExpression() {
+        KotlinPropertyStub stub = getStub();
+        if (stub != null && !stub.hasDelegateExpression()) {
+            return null;
+        }
+
         KtPropertyDelegate delegate = getDelegate();
         if (delegate != null) {
             return delegate.getExpression();
         }
+
         return null;
     }