[regexp] fix /ui regexp desugaring for text nodes.

src/regexp/regexp-parser.cc

 // 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.
 
 #include "src/regexp/regexp-parser.h"
 
 #include "src/char-predicates-inl.h"
 #include "src/factory.h"
 #include "src/isolate.h"
 #include "src/objects-inl.h"
@@ skipping 1455 matching lines @@
     alternative = new (zone()) RegExpAlternative(terms_.GetList(zone()));
   }
   alternatives_.Add(alternative, zone());
   terms_.Clear();
   LAST(ADD_NONE);
 }
 
 
 bool RegExpBuilder::NeedsDesugaringForUnicode(RegExpCharacterClass* cc) {
   if (!unicode()) return false;
-  switch (cc->standard_type()) {
-    case 's':        // white space
-    case 'w':        // ASCII word character
-    case 'd':        // ASCII digit
-      return false;  // These characters do not need desugaring.
-    default:
-      break;
-  }
+  // TODO(yangguo): we could be smarter than this. Case-insensitivity does not
+  // necessarily mean that we need to desugar. It's probably nicer to have a
+  // separate pass to figure out unicode desugarings.
+  if (ignore_case()) return true;
   ZoneList<CharacterRange>* ranges = cc->ranges(zone());
   CharacterRange::Canonicalize(ranges);
   for (int i = ranges->length() - 1; i >= 0; i--) {
     uc32 from = ranges->at(i).from();
     uc32 to = ranges->at(i).to();
     // Check for non-BMP characters.
     if (to >= kNonBmpStart) return true;
     // Check for lone surrogates.
     if (from <= kTrailSurrogateEnd && to >= kLeadSurrogateStart) return true;
   }
@@ skipping 71 matching lines @@
     return false;
   }
   terms_.Add(new (zone()) RegExpQuantifier(min, max, quantifier_type, atom),
              zone());
   LAST(ADD_TERM);
   return true;
 }
 
 }  // namespace internal
 }  // namespace v8