Fix signature of accessor for suspend function

It must be a suspend function too to have an additional Continuation parameter

 #KT-15715 Fixed

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/FunctionDescriptorImpl.java

@@ -60,7 +60,7 @@ public abstract class FunctionDescriptorImpl extends DeclarationDescriptorNonRoo
     @Nullable
     private FunctionDescriptor initialSignatureDescriptor = null;
 
-    private Map<UserDataKey<?>, Object> userDataMap = null;
+    protected Map<UserDataKey<?>, Object> userDataMap = null;
 
     protected FunctionDescriptorImpl(
             @NotNull DeclarationDescriptor containingDeclaration,