deps: cherry-pick a51f429 from V8 upstream

Original commit message:
  [regexp] Fix case-insensitive matching for one-byte subjects.

  The bug occurs because we do not canonicalize character class ranges
  before adding case equivalents. While adding case equivalents, we abort
  early for one-byte subject strings, assuming that the ranges are sorted.
  Which they are not.

  R=marja@chromium.org
  BUG=v8:5199

  Review-Url: https://codereview.chromium.org/2159683002
  Cr-Commit-Position: refs/heads/master@{#37833}

Fixes: #7708

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 5
 #define V8_MINOR_VERSION 1
 #define V8_BUILD_NUMBER 281
-#define V8_PATCH_LEVEL 77
+#define V8_PATCH_LEVEL 78
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/regexp/jsregexp.cc

@@ -5879,6 +5879,7 @@ Vector<const int> CharacterRange::GetWordBounds() {
 void CharacterRange::AddCaseEquivalents(Isolate* isolate, Zone* zone,
                                         ZoneList<CharacterRange>* ranges,
                                         bool is_one_byte) {
+  CharacterRange::Canonicalize(ranges);
   int range_count = ranges->length();
   for (int i = 0; i < range_count; i++) {
     CharacterRange range = ranges->at(i);

deps/v8/test/mjsunit/regress/regress-5199.js

@@ -0,0 +1,5 @@
+// Copyright 2016 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.
+
+assertTrue(/(a[\u1000A])+/i.test('aa'));