Subzero: Use a "deterministic" random shuffle for register allocation.

To make this work, Subzero provides its own RandomShuffle() as a replacement for std::random_shuffle(), and the Subzero implementation doesn't depend on the stdlib implementation.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4129
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1072913002