[rth: Avoid redundant qemu_ld in locked case.  Fix previously unnoticed
incorrect zero-extension of address in register-offset case.]
Signed-off-by: NEmilio G. Cota <cota@braap.org>
Message-Id: <1467054136-10430-18-git-send-email-cota@braap.org>
Signed-off-by: NRichard Henderson <rth@twiddle.net>