FIR2IR: add fallback for a synthetic property override situation

compiler/testData/codegen/box/fir/CustomHashSetSize.kt

@@ -0,0 +1,65 @@
+// TARGET_BACKEND: JVM_IR
+// WITH_RUNTIME
+
+// MODULE: m1
+// FILE: m1/THash.java
+
+package m1;
+
+public class THash {
+
+    public int size() { return 1; }
+}
+
+// FILE: m1/TObjectHash.java
+
+package m1;
+
+public class TObjectHash<T> extends THash {}
+
+// FILE: m1/THashSet.java
+
+package m1;
+import java.util.*;
+
+public class THashSet<T> extends TObjectHash<T> implements Set<T> {
+    public Iterator<T> iterator() { return null; }
+
+    public boolean isEmpty() { return false; }
+
+    public boolean contains(Object o) { return false; }
+
+    public Object[] toArray() { return new Object[1]; }
+
+    public <T> T[] toArray(T[] a) { throw new RuntimeException(); }
+
+    public boolean add(T e) { return false; }
+
+    public boolean remove(Object o) { return false; }
+
+    public boolean containsAll(Collection<?> c) { return false; }
+
+    public boolean addAll(Collection<? extends T> c) { return false; }
+
+    public boolean retainAll(Collection<?> c) { return false; }
+
+    public boolean removeAll(Collection<?> c) { return false; }
+
+    public void clear() {}
+}
+
+// MODULE: m2(m1)
+// FILE: box.kt
+
+package m2
+import m1.THashSet
+
+interface HeaderSet : Set<String>
+
+class MutableHeaderSet : HeaderSet, MutableSet<String>, THashSet<String>()
+
+fun box(): String {
+    val size1 = THashSet<String>().size
+    val size2 = MutableHeaderSet().size
+    return if (size1 == 1 && size2 == 1) "OK" else "$size1/$size2"
+}