Fix input and output to handle UTF16 surrogate pairs.

src/x64/regexp-macro-assembler-x64.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 546 matching lines @@
   __ cmpl(rax, Immediate(c));
   BranchOrBacktrack(not_equal, on_not_equal);
 }
 
 
 void RegExpMacroAssemblerX64::CheckNotCharacterAfterMinusAnd(
     uc16 c,
     uc16 minus,
     uc16 mask,
     Label* on_not_equal) {
-  ASSERT(minus < String::kMaxUC16CharCode);
+  ASSERT(minus < String::kMaxUtf16CodeUnit);
   __ lea(rax, Operand(current_character(), -minus));
   __ and_(rax, Immediate(mask));
   __ cmpl(rax, Immediate(c));
   BranchOrBacktrack(not_equal, on_not_equal);
 }
 
 
 bool RegExpMacroAssemblerX64::CheckSpecialCharacterClass(uc16 type,
                                                          Label* on_no_match) {
   // Range checks (c in min..max) are generally implemented by an unsigned
@@ skipping 838 matching lines @@
   }
 }
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64