Port Latin-1 changes to the interpreted regexp.

src/interpreter-irregexp.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 55 matching lines @@
 
 static bool BackRefMatchesNoCase(Canonicalize* interp_canonicalize,
                                  int from,
                                  int current,
                                  int len,
                                  Vector<const uint8_t> subject) {
   for (int i = 0; i < len; i++) {
     unsigned int old_char = subject[from++];
     unsigned int new_char = subject[current++];
     if (old_char == new_char) continue;
-    if (old_char - 'A' <= 'Z' - 'A') old_char |= 0x20;
-    if (new_char - 'A' <= 'Z' - 'A') new_char |= 0x20;
+    // Convert both characters to lower case.
+    old_char |= 0x20;
+    new_char |= 0x20;
     if (old_char != new_char) return false;
+    // Not letters in the ASCII range and Latin-1 range.
+    if (!(old_char - 'a' <= 'z' - 'a') &&
+        !(old_char - 224 <= 254 - 224 && old_char != 247)) {
+      return false;
+    }
   }
   return true;
 }
 
 
 #ifdef DEBUG
 static void TraceInterpreter(const byte* code_base,
                              const byte* pc,
                              int stack_depth,
                              int current_position,
@@ skipping 543 matching lines @@
     return RawMatch(isolate,
                     code_base,
                     subject_vector,
                     registers,
                     start_position,
                     previous_char);
   }
 }
 
 } }  // namespace v8::internal