Allow identifier code points from supplementary multilingual planes.

test/intl/general/smp-identifier.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function toSurrogatePair(c) {
+  return String.fromCharCode(((c - 0x10000) >>> 10) & 0x3FF | 0xD800) +
+         String.fromCharCode(c & 0x3FF | 0xDC00);
+}
+
+function testIdStart(c, is_id_start) {
+  var source = "var " + toSurrogatePair(c);
+  print(source);
+  if (is_id_start) {
+    assertDoesNotThrow(source);
+  } else {
+    assertThrows(source);
+  }
+}
+
+function testIdPart(c, is_id_start) {
+  var source = "var v" + toSurrogatePair(c);
+  print(source);
+  if (is_id_start) {
+    assertDoesNotThrow(source);
+  } else {
+    assertThrows(source);
+  }
+}
+
+[0x10403, 0x1043C, 0x16F9C, 0x10048, 0x1014D].forEach(function(c) {
+  testIdStart(c, true);
+  testIdPart(c, true);
+});
+
+[0x101FD, 0x11002, 0x104A9].forEach(function(c) {
+  testIdStart(c, false);
+  testIdPart(c, true);
+});
+
+[0x10111, 0x1F4A9].forEach(function(c) {
+  testIdStart(c, false);
+  testIdPart(c, false);
+});