Collect overrides of special builtin members in super types

#KT-9695 Fixed

compiler/testData/diagnostics/tests/j+k/collectionOverrides/irrelevantImplCharSequenceKotlin.kt

@@ -0,0 +1,28 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// FILE: AImpl.kt
+
+abstract class AImpl {
+    fun charAt(index: Int): Char {
+        return '1'
+    }
+
+    fun length(): Int {
+        return 1
+    }
+}
+
+// FILE: A.java
+public class A extends AImpl implements CharSequence {
+    public CharSequence subSequence(int start, int end) {
+        return null;
+    }
+}
+
+// FILE: X.kt
+class X : A()
+
+fun main() {
+    val x = X()
+    x[0]
+    x.length
+}