Minor: add test to call callable references from Java

compiler/backend/src/org/jetbrains/kotlin/codegen/ExpressionCodegen.java

@@ -1124,7 +1124,9 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
                 if (!isCrossinlineLambda) {
                     v.aconst(null);
                 }
-            } else if (DescriptorUtilsKt.isCallableReferenceToSuspend(classDescriptor, state.getJvmRuntimeTypes().getFunctionReference())) {
+            }
+            else if (classDescriptor instanceof SyntheticClassDescriptorForLambda &&
+                     ((SyntheticClassDescriptorForLambda) classDescriptor).isCallableReference()) {
                 // Constructor of callable reference to suspend function does not accept continuation:
                 // do nothing.
             }

compiler/backend/src/org/jetbrains/kotlin/codegen/SyntheticClassDescriptorForLambda.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.codegen
@@ -21,8 +10,10 @@ import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.impl.ClassDescriptorImpl
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.psi.KtCallableReferenceExpression
 import org.jetbrains.kotlin.psi.KtElement
 import org.jetbrains.kotlin.resolve.scopes.MemberScope
+import org.jetbrains.kotlin.resolve.source.getPsi
 import org.jetbrains.kotlin.resolve.source.toSourceElement
 import org.jetbrains.kotlin.storage.LockBasedStorageManager
 import org.jetbrains.kotlin.types.KotlinType
@@ -37,4 +28,6 @@ class SyntheticClassDescriptorForLambda(
     init {
         initialize(MemberScope.Empty, emptySet(), null)
     }
+
+    fun isCallableReference(): Boolean = source.getPsi() is KtCallableReferenceExpression
 }