Use ICU for ID_START and ID_CONTINUE for Unicode 9 data

test/webkit/parseFloat.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 // 1.  Redistributions of source code must retain the above copyright
 //     notice, this list of conditions and the following disclaimer.
 // 2.  Redistributions in binary form must reproduce the above copyright
 //     notice, this list of conditions and the following disclaimer in the
@@ skipping 63 matching lines @@
 shouldBe("parseFloat(illegalUTF16Sequence + '1')", "NaN");
 shouldBe("parseFloat(tab + '1')", "1");
 shouldBe("parseFloat(nbsp + '1')", "1");
 shouldBe("parseFloat(ff + '1')", "1");
 shouldBe("parseFloat(vt + '1')", "1");
 shouldBe("parseFloat(cr + '1')", "1");
 shouldBe("parseFloat(lf + '1')", "1");
 shouldBe("parseFloat(ls + '1')", "1");
 shouldBe("parseFloat(ps + '1')", "1");
 shouldBe("parseFloat(oghamSpaceMark + '1')", "1");
-shouldBe("parseFloat(mongolianVowelSeparator + '1')", "1");
+shouldBe("parseFloat(mongolianVowelSeparator + '1')", "NaN");
 shouldBe("parseFloat(enQuad + '1')", "1");
 shouldBe("parseFloat(emQuad + '1')", "1");
 shouldBe("parseFloat(enSpace + '1')", "1");
 shouldBe("parseFloat(emSpace + '1')", "1");
 shouldBe("parseFloat(threePerEmSpace + '1')", "1");
 shouldBe("parseFloat(fourPerEmSpace + '1')", "1");
 shouldBe("parseFloat(sixPerEmSpace + '1')", "1");
 shouldBe("parseFloat(figureSpace + '1')", "1");
 shouldBe("parseFloat(punctuationSpace + '1')", "1");
 shouldBe("parseFloat(thinSpace + '1')", "1");
 shouldBe("parseFloat(hairSpace + '1')", "1");
 shouldBe("parseFloat(narrowNoBreakSpace + '1')", "1");
 shouldBe("parseFloat(mediumMathematicalSpace + '1')", "1");
 shouldBe("parseFloat(ideographicSpace + '1')", "1");