JVM_IR: Add attributes to named suspend functions

This is a prerequisite to moving continuation classes inside said
functions, which is needed to support crossinline suspend lambdas.
The logic of whether to copy attributes on lowerings or not is simple:
  - if the lowering moves function body to a new place, it should copy
  the attributes.
  - if the lowering just generates new declarations (i.e. bridges), it
  should leave attributes as is.

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/FunctionGenerator.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2017 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 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.psi2ir.generators
@@ -67,6 +56,10 @@ class FunctionGenerator(declarationGenerator: DeclarationGenerator) : Declaratio
             ?.let {
                 declareSimpleFunctionInner(it, ktElement, IrDeclarationOrigin.FAKE_OVERRIDE).buildWithScope { irFunction ->
                     generateFunctionParameterDeclarationsAndReturnType(irFunction, ktElement, null)
+                    val overridenSymbol = irFunction.overriddenSymbols.first()
+                    if (overridenSymbol.isBound) {
+                        irFunction.copyAttributes(overridenSymbol.owner)
+                    }
                 }
             }