KT-6807 J2K: Convert "==" to "===" if class has equals() method

#KT-6807 Fixed

j2k/testData/fileOrElement/equals/EqOperator.java

@@ -0,0 +1,39 @@
+interface I{}
+
+final class C{}
+
+class O{}
+
+final class E {
+    @Override
+    public boolean equals(Object o) {
+        return super.equals(o);
+    }
+}
+
+class B {
+    @Override
+    public boolean equals(Object o) {
+        return super.equals(o);
+    }
+}
+
+final class BB extends B {}
+
+class X {
+    void foo(I i1, I i2, String s1, String s2, C c1, C c2, int i, O o1, O o2, E e1, E e2, BB bb1, BB bb2, int[] arr1, int[] arr2) {
+        if (i1 == i2) return;
+        if (s1 == s2) return;
+        if (c1 == c2) return;
+        if (i1 == null) return;
+        if (null == i2) return;
+        if (i == 0) return;
+        if (o1 == o2) return;
+        if (e1 == e2) return;
+        if (bb1 == bb2) return;
+        if (arr1 == arr2) return;
+
+        if (s1 != s2) return;
+        if (c1 != c2) return;
+    }
+}