Fixed environment handling for LFlooringDivI on ARM.

test/mjsunit/regress/regress-437765.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 --no-fold-constants
+
+function foo(x, y) {
+  return Math.floor(x / y);
+}
+
+function bar(x, y) {
+  return foo(x + 1, y + 1);
+}
+
+function baz() {
+  bar(64, 2);
+}
+
+baz();
+baz();
+%OptimizeFunctionOnNextCall(baz);
+baz();