[turbofan] Fix translation of uint32 deopt immediates.

test/mjsunit/regress/regress-crbug-681983.js

Index: test/mjsunit/regress/regress-crbug-681983.js
diff --git a/test/mjsunit/regress/regress-crbug-681983.js b/test/mjsunit/regress/regress-crbug-681983.js
new file mode 100644
index 0000000000000000000000000000000000000000..eab161c97cafdb72ad9f482ed4b07890a0c9ebe1
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-681983.js
@@ -0,0 +1,18 @@
+// 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
+
+function g(a) {
+  a = a >>> 0;
+  %_DeoptimizeNow();
+  return a;
+}
+
+function f() {
+  return g(-1);
+}
+
+%OptimizeFunctionOnNextCall(f);
+assertEquals(4294967295, f());