s390x: implement lrvgr

The LRVGR instruction was missing. Implement it, so everyone's happy.

Reported-by: Balazs Kutil <bkutil@novell.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

target-s390x/translate.c

diff --git a/target-s390x/translate.c b/target-s390x/translate.c
index afeb5e6..eda4624 100644
--- a/target-s390x/translate.c
+++ b/target-s390x/translate.c
@@ -3473,6 +3473,9 @@
         tcg_temp_free_i64(tmp2);
         tcg_temp_free_i64(tmp3);
         break;
+    case 0x0f: /* LRVGR    R1,R2     [RRE] */
+        tcg_gen_bswap64_i64(regs[r1], regs[r2]);
+        break;
     case 0x1f: /* LRVR     R1,R2     [RRE] */
         tmp32_1 = load_reg32(r2);
         tcg_gen_bswap32_i32(tmp32_1, tmp32_1);