target/m68k: fix gen_get_ccr()

As gen_helper_get_ccr() is able to compute CCR from cc_op and
flags, we don't need to flush flags before to call it.
flush_flags() and get_ccr() use COMPUTE_CCR() to compute
flags. get_ccr() computes CCR value,
whereas flush_flags update live cc_op and flags.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180104012913.30763-3-laurent@vivier.eu>

target/m68k/translate.c

@@ -2478,7 +2478,6 @@ static TCGv gen_get_ccr(DisasContext *s)
 {
     TCGv dest;
 
-    gen_flush_flags(s);
     update_cc_op(s);
     dest = tcg_temp_new();
     gen_helper_get_ccr(dest, cpu_env);