[crankshaft] Fix deoptimization loop w/ non-monomorphic arguments access.

test/mjsunit/compiler/deopt-arguments-oob.js

+// Copyright 2016 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 foo() { return arguments[0]; }
+
+// Warm up with monomorphic access.
+foo(0);
+foo(1);
+%BaselineFunctionOnNextCall(foo);
+foo(2);
+foo(3);
+%OptimizeFunctionOnNextCall(foo);
+
+// Mess with out-of-bounds accesses.
+for (var i = 0; i < 50000; ++i) {
+  foo();
+}
+
+// Optimization shall stabilize now.
+var count = %GetOptimizationCount(foo);
+for (var i = 0; i < 50000; ++i) {
+  foo();
+}
+assertEquals(count, %GetOptimizationCount(foo));