Collect overrides of special builtin members in super types

#KT-9695 Fixed

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

@@ -0,0 +1,25 @@
+// FILE: AImpl.java
+
+abstract public class AImpl {
+    public char charAt(int index) {
+        return '1';
+    }
+
+    public final int length() { 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
+}