Render unwrapped suspend function in backend

Hierarchy of specially wrapped suspend function may have inconsistent
 overridden descriptors: some of them may be wrapped, some unwrapped.
 To mitigate this problem, currently it's proposed to render only
 unwrapped functions, which are always have stable overridden descriptors

 #KT-23809 Fixed

compiler/testData/codegen/dumpDeclarations/intermediateAbstractSuspendFunction.kt

@@ -0,0 +1,9 @@
+interface A<T> {
+    suspend fun foo(): T
+}
+
+interface B<K> : A<K>
+
+abstract class C<V> : B<V> {
+    override suspend fun foo(): V = TODO()
+}