Revert the (wrong) fix of the argument index check asserion.

R=ishell@chromium.org
BUG=

Review URL: https://codereview.chromium.org/208423017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20219 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/lithium-codegen-x64.cc

@@ -2910,14 +2910,9 @@ void LCodeGen::DoAccessArgumentsAt(LAccessArgumentsAt* instr) {
       instr->index()->IsConstantOperand()) {
     int32_t const_index = ToInteger32(LConstantOperand::cast(instr->index()));
     int32_t const_length = ToInteger32(LConstantOperand::cast(instr->length()));
-    if (const_index < const_length) {
-      StackArgumentsAccessor args(arguments, const_length,
-                                  ARGUMENTS_DONT_CONTAIN_RECEIVER);
-      __ movp(result, args.GetArgumentOperand(const_index));
-    } else {
-      // This code should never be executed; just stop here.
-      __ int3();
-    }
+    StackArgumentsAccessor args(arguments, const_length,
+                                ARGUMENTS_DONT_CONTAIN_RECEIVER);
+    __ movp(result, args.GetArgumentOperand(const_index));
   } else {
     Register length = ToRegister(instr->length());
     // There are two words between the frame pointer and the last argument.

test/mjsunit/regress/regress-355486.js

-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --allow-natives-syntax
-
-function f() { var v = arguments[0]; }
-function g() { f(); }
-
-g();
-g();
-%OptimizeFunctionOnNextCall(g);
-g();