Tries enable jecxz in 32-bit mode as jrcxz is allowed in 64-bit mode.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3547
TBR=shyamsundarr@chromium.org,phosek@chromium.org,gdeepti@chromium.org

Review URL: https://codereview.chromium.org/961163003
2 files changed