[regexp] Fix case-insensitive matching for one-byte subjects.

src/regexp/jsregexp.cc

Index: src/regexp/jsregexp.cc
diff --git a/src/regexp/jsregexp.cc b/src/regexp/jsregexp.cc
index aba793723a30a7c06d6138b8a6eb490d8620bdd4..c3b670b51825cbfa3baf3b989525660a150b9920 100644
--- a/src/regexp/jsregexp.cc
+++ b/src/regexp/jsregexp.cc
@@ -5890,6 +5890,7 @@ 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);