target-m68k: fix gen_flush_flags()

target-m68k: fix gen_flush_flags()

gen_flush_flags() is setting unconditionally cc_op_synced to 1
and s->cc_op to CC_OP_FLAGS, whereas env->cc_op can be set
to something else by a previous tcg fragment.

We fix that by not setting cc_op_synced to 1
(except for gen_helper_flush_flags() that updates env->cc_op)

FIX: https://github.com/vivier/qemu-m68k/issues/19

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1484332593-16782-3-git-send-email-laurent@vivier.eu>