Fix tests: "infix modifier required" and "operator modifier required" errors

compiler/testData/codegen/box/javaInterop/objectMethods/cloneCallsConstructor.kt

@@ -6,6 +6,6 @@ fun box(): String {
     val a = A(42)
     val b = a.clone()
     if (b != a) return "Fail equals"
-    if (b identityEquals a) return "Fail identity"
+    if (b.identityEquals(a)) return "Fail identity"
     return "OK"
 }

compiler/testData/codegen/box/javaInterop/objectMethods/cloneCallsSuper.kt

@@ -6,6 +6,6 @@ fun box(): String {
     val a = A(42)
     val b = a.clone()
     if (a != b) return "Fail equals"
-    if (a identityEquals b) return "Fail identity"
+    if (a.identityEquals(b)) return "Fail identity"
     return "OK"
 }

compiler/testData/codegen/box/javaInterop/objectMethods/cloneCallsSuperAndModifies.kt

@@ -10,7 +10,7 @@ fun box(): String {
     val a = A(42)
     val b = a.clone()
     if (a == b) return "Fail: $a == $b"
-    if (a identityEquals b) return "Fail: $a identityEquals $b"
+    if (a.identityEquals(b)) return "Fail: $a identityEquals $b"
     if (b.x != 239) return "Fail: b.x = ${b.x}"
     return "OK"
 }

compiler/testData/codegen/box/javaInterop/objectMethods/cloneHashSet.kt

@@ -7,6 +7,6 @@ fun box(): String {
     a.add("prosper")
     val b = a.clone()
     if (a != b) return "Fail equals"
-    if (a identityEquals b) return "Fail identity"
+    if (a.identityEquals(b)) return "Fail identity"
     return "OK"
 }

compiler/testData/codegen/box/javaInterop/objectMethods/cloneHierarchy.kt

@@ -25,8 +25,8 @@ fun box(): String {
 
     if (c.s != d.s) return "Fail s: ${d.s}"
     if (c.l != d.l) return "Fail l: ${d.l}"
-    if (c.l identityEquals d.l) return "Fail list identity"
-    if (c identityEquals d) return "Fail identity"
+    if (c.l.identityEquals(d.l)) return "Fail list identity"
+    if (c.identityEquals(d)) return "Fail identity"
 
     return "OK"
 }

compiler/testData/codegen/box/javaInterop/objectMethods/cloneableClassWithoutClone.kt

@@ -6,6 +6,6 @@ fun box(): String {
     val a = A("OK")
     val b = a.externalClone()
     if (a != b) return "Fail equals"
-    if (a identityEquals b) return "Fail identity"
+    if (a.identityEquals(b)) return "Fail identity"
     return b.s
 }