[compiler] Add regression test exhibiting int64 deopt literals.

R=jarin@chromium.org

Bug: chromium:791958
Change-Id: I483558270f4dfa845dff4ff88076be27bb15cc8e
Reviewed-on: https://chromium-review.googlesource.com/808804Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49867}

test/mjsunit/regress/regress-791958.js

+// Copyright 2017 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
+
+obj = {m: print};
+function foo() {
+  for (var x = -536870912; x != -536870903; ++x) {
+    obj.m(-x >= 1000000 ? x % 1000000 : y);
+  }
+}
+foo();
+%OptimizeFunctionOnNextCall(foo);
+foo();