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

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

Index: src/ia32/regexp-macro-assembler-ia32.h
===================================================================
--- src/ia32/regexp-macro-assembler-ia32.h	(revision 3701)
+++ src/ia32/regexp-macro-assembler-ia32.h	(working copy)
@@ -123,8 +123,7 @@
   static const int kInputStart = kStartIndex + kPointerSize;
   static const int kInputEnd = kInputStart + kPointerSize;
   static const int kRegisterOutput = kInputEnd + 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 - local stack variables.
   // When adding local variables remember to push space for them in
@@ -133,8 +132,9 @@
   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 = kInputStartMinusOne - kPointerSize;
+  static const int kRegisterZero = kAtStart - kPointerSize;
 
   // Initial size of code buffer.
   static const size_t kRegExpCodeSize = 1024;