[regexp] correctly parse non-BMP unicode escapes in atoms.

test/cctest/test-regexp.cc

Index: test/cctest/test-regexp.cc
diff --git a/test/cctest/test-regexp.cc b/test/cctest/test-regexp.cc
index dfa52ed7504c90dd1def01b3b3848f778af2013f..acbb26f7c7401ce42bb8c1dc6a0278c51cec0a6d 100644
--- a/test/cctest/test-regexp.cc
+++ b/test/cctest/test-regexp.cc
@@ -100,13 +100,14 @@ static bool CheckParse(const char* input) {
 }
 
 
-static void CheckParseEq(const char* input, const char* expected) {
+static void CheckParseEq(const char* input, const char* expected,
+                         bool unicode = false) {
   v8::HandleScope scope(CcTest::isolate());
   Zone zone;
   FlatStringReader reader(CcTest::i_isolate(), CStrVector(input));
   RegExpCompileData result;
   CHECK(v8::internal::RegExpParser::ParseRegExp(
-      CcTest::i_isolate(), &zone, &reader, false, false, &result));
+      CcTest::i_isolate(), &zone, &reader, false, unicode, &result));
   CHECK(result.tree != NULL);
   CHECK(result.error.is_null());
   std::ostringstream os;
@@ -163,6 +164,7 @@ static MinMaxPair CheckMinMaxMatch(const char* input) {
 
 void TestRegExpParser(bool lookbehind) {
   FLAG_harmony_regexp_lookbehind = lookbehind;
+  FLAG_harmony_unicode_regexps = true;
 
   CHECK_PARSE_ERROR("?");
 
@@ -305,6 +307,12 @@ void TestRegExpParser(bool lookbehind) {
   CheckParseEq("\\u003z", "'u003z'");
   CheckParseEq("foo[z]*", "(: 'foo' (# 0 - g [z]))");
 
+  // Unicode regexps
+  CheckParseEq("\\u{12345}", "'\\ud808\\udf45'", true);
+  CheckParseEq("\\u{12345}\\u{23456}", "'\\ud808\\udf45\\ud84d\\udc56'", true);
+  CheckParseEq("\\u{12345}|\\u{23456}", "(| '\\ud808\\udf45' '\\ud84d\\udc56')",
+               true);
+
   CHECK_SIMPLE("", false);
   CHECK_SIMPLE("a", true);
   CHECK_SIMPLE("a|b", false);