Add tests for cross‑realm and subclass `RegExp.prototype.compile` calls

test/annexB/built-ins/RegExp/prototype/compile/this-cross-realm-instance.js

@@ -0,0 +1,34 @@
+// Copyright (C) 2020 ExE Boss. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-regexp.prototype.compile
+description: RegExp.prototype.compile throws a TypeError for cross-realm calls
+features: [legacy-regexp,cross-realm]
+---*/
+
+const other = $262.createRealm().global;
+
+const regexp = new RegExp("");
+const otherRealm_regexp = new other.RegExp("");
+
+assert.throws(
+  TypeError,
+  function () {
+    RegExp.prototype.compile.call(otherRealm_regexp);
+  },
+  "`RegExp.prototype.compile.call(otherRealm_regexp)` throws TypeError"
+);
+
+assert.throws(
+  TypeError,
+  function () {
+    other.RegExp.prototype.compile.call(regexp);
+  },
+  "`other.RegExp.prototype.compile.call(regexp)` throws TypeError"
+);
+
+assert.sameValue(
+  otherRealm_regexp.compile(),
+  otherRealm_regexp,
+  "`otherRealm_regexp.compile()` is SameValue with `otherRealm_regexp`"
+);

test/annexB/built-ins/RegExp/prototype/compile/this-subclass-instance.js

@@ -0,0 +1,25 @@
+// Copyright (C) 2020 ExE Boss. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-regexp.prototype.compile
+description: RegExp.prototype.compile throws a TypeError for calls on subclasses
+features: [legacy-regexp,class]
+---*/
+
+const subclass_regexp = new (class extends RegExp {})("");
+
+assert.throws(
+  TypeError,
+  function () {
+    subclass_regexp.compile();
+  },
+  "`subclass_regexp.compile()` throws TypeError"
+);
+
+assert.throws(
+  TypeError,
+  function () {
+    RegExp.prototype.compile.call(subclass_regexp);
+  },
+  "`RegExp.prototype.compile.call(subclass_regexp)` throws TypeError"
+);