Don't generate bridges for equals(), hashCode(), toString()

Otherwise an assertion is failing in the algorithm which is related to an
inconsistency of java.lang.Object inheritance in JDR (KT-4890)

compiler/testData/codegen/box/classes/inheritSetAndHashSet.kt

@@ -0,0 +1,11 @@
+import java.util.HashSet
+
+trait A : Set<String>
+
+class B : A, HashSet<String>()
+
+fun box(): String {
+    val b = B()
+    b.add("OK")
+    return b.iterator().next()
+}