Don't pass the "at start" parameter to native RegExp...

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

 // Copyright 2006-2008 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 105 matching lines @@
   // Offsets from frame_pointer() of function parameters and stored registers.
   static const int kFramePointer = 0;
 
   // Above the frame pointer - Stored registers and stack passed parameters.
   // Register 4..11.
   static const int kStoredRegisters = kFramePointer;
   // Return address (stored from link register, read into pc on return).
   static const int kReturnAddress = kStoredRegisters + 8 * kPointerSize;
   // Stack parameters placed by caller.
   static const int kRegisterOutput = kReturnAddress + kPointerSize;
-  static const int kAtStart = kRegisterOutput + kPointerSize;
-  static const int kStackHighEnd = kAtStart + kPointerSize;
+  static const int kStackHighEnd = kRegisterOutput + kPointerSize;
   static const int kDirectCall = kStackHighEnd + kPointerSize;
 
   // Below the frame pointer.
   // Register parameters stored by setup code.
   static const int kInputEnd = kFramePointer - kPointerSize;
   static const int kInputStart = kInputEnd - kPointerSize;
   static const int kStartIndex = kInputStart - kPointerSize;
   static const int kInputString = kStartIndex - kPointerSize;
   // When adding local variables remember to push space for them in
   // the frame in GetCode.
   static const int kInputStartMinusOne = kInputString - kPointerSize;
+  static const int kAtStart = kInputStartMinusOne - kPointerSize;
   // First register address. Following registers are below it on the stack.
-  static const int kRegisterZero = kInputStartMinusOne - kPointerSize;
+  static const int kRegisterZero = kAtStart - kPointerSize;
 
   // Initial size of code buffer.
   static const size_t kRegExpCodeSize = 1024;
 
   static const int kBacktrackConstantPoolSize = 4;
 
   // 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);
 
@@ skipping 122 matching lines @@
   int MinorKey() { return 0; }
   const char* GetName() { return "RegExpCEntryStub"; }
 };
 
 #endif  // V8_NATIVE_REGEXP
 
 
 }}  // namespace v8::internal
 
 #endif  // V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_