[FE 1.0] Don't throw exception during substitution of accessors, just return original

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

@@ -119,7 +119,7 @@ public abstract class PropertyAccessorDescriptorImpl extends DeclarationDescript
     @NotNull
     @Override
     public FunctionDescriptor substitute(@NotNull TypeSubstitutor substitutor) {
-        throw new UnsupportedOperationException(); // TODO
+        return this; // no substitution since we work with originals of accessors in the backend anyway
     }
 
     @NotNull