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

src/regexp-macro-assembler.cc

 // Copyright 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 126 matching lines @@
 
   const byte* input_start =
       StringCharacterPosition(subject_ptr, start_offset);
   int byte_length = char_length << char_size_shift;
   const byte* input_end = input_start + byte_length;
   Result res = Execute(*regexp_code,
                        subject_ptr,
                        start_offset,
                        input_start,
                        input_end,
-                       offsets_vector,
-                       previous_index == 0);
+                       offsets_vector);
   return res;
 }
 
 
 NativeRegExpMacroAssembler::Result NativeRegExpMacroAssembler::Execute(
     Code* code,
     String* input,
     int start_offset,
     const byte* input_start,
     const byte* input_end,
-    int* output,
-    bool at_start) {
+    int* output) {
   typedef int (*matcher)(String*, int, const byte*,
-                         const byte*, int*, int, Address, int);
+                         const byte*, int*, Address, int);
   matcher matcher_func = FUNCTION_CAST<matcher>(code->entry());
 
-  int at_start_val = at_start ? 1 : 0;
-
   // Ensure that the minimum stack has been allocated.
   RegExpStack stack;
   Address stack_base = RegExpStack::stack_base();
 
   int direct_call = 0;
   int result = CALL_GENERATED_REGEXP_CODE(matcher_func,
                                           input,
                                           start_offset,
                                           input_start,
                                           input_end,
                                           output,
-                                          at_start_val,
                                           stack_base,
                                           direct_call);
   ASSERT(result <= SUCCESS);
   ASSERT(result >= RETRY);
 
   if (result == EXCEPTION && !Top::has_pending_exception()) {
     // We detected a stack overflow (on the backtrack stack) in RegExp code,
     // but haven't created the exception yet.
     Top::StackOverflow();
   }
@@ skipping 69 matching lines @@
   if (new_stack_base == NULL) {
     return NULL;
   }
   *stack_base = new_stack_base;
   intptr_t stack_content_size = old_stack_base - stack_pointer;
   return new_stack_base - stack_content_size;
 }
 
 #endif  // V8_NATIVE_REGEXP
 } }  // namespace v8::internal