RegExp: Remove use of 16-bit immediates on ia32/x64.

src/ia32/regexp-macro-assembler-ia32.h

 // Copyright 2008-2009 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 114 matching lines @@
   static const int kRegisterOutput = kInputEnd + kPointerSize;
   static const int kStackHighEnd = kRegisterOutput + kPointerSize;
   static const int kDirectCall = kStackHighEnd + kPointerSize;
   // Below the frame pointer - local stack variables.
   // When adding local variables remember to push space for them in
   // the frame in GetCode.
   static const int kBackup_esi = kFramePointer - kPointerSize;
   static const int kBackup_edi = kBackup_esi - kPointerSize;
   static const int kBackup_ebx = kBackup_edi - kPointerSize;
   static const int kInputStartMinusOne = kBackup_ebx - kPointerSize;
-  static const int kAtStart = kInputStartMinusOne - kPointerSize;
   // First register address. Following registers are below it on the stack.
-  static const int kRegisterZero = kAtStart - kPointerSize;
+  static const int kRegisterZero = kInputStartMinusOne - kPointerSize;
 
   // Initial size of code buffer.
   static const size_t kRegExpCodeSize = 1024;
 
   // Load a number of characters at the given offset from the
   // current position, into the current-character register.
   void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);
 
   // Check whether preemption has been requested.
   void CheckPreemption();
@@ skipping 58 matching lines @@
   Label backtrack_label_;
   Label exit_label_;
   Label check_preempt_label_;
   Label stack_overflow_label_;
 };
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_