s390x: Enable disassembler for s390x

This patch enables the instruction disassembler when using an
S390x target.
Signed-off-by: NUlrich Hecht <uli@suse.de>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

disas.c

@@ -215,6 +215,9 @@ void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
         disasm_info.mach = bfd_mach_cris_v32;
         print_insn = print_insn_crisv32;
     }
+#elif defined(TARGET_S390X)
+    disasm_info.mach = bfd_mach_s390_64;
+    print_insn = print_insn_s390;
 #elif defined(TARGET_MICROBLAZE)
     disasm_info.mach = bfd_arch_microblaze;
     print_insn = print_insn_microblaze;
@@ -414,6 +417,9 @@ void monitor_disas(Monitor *mon, CPUState *env,
 #elif defined(TARGET_SH4)
     disasm_info.mach = bfd_mach_sh4;
     print_insn = print_insn_sh;
+#elif defined(TARGET_S390X)
+    disasm_info.mach = bfd_mach_s390_64;
+    print_insn = print_insn_s390;
 #else
     monitor_printf(mon, "0x" TARGET_FMT_lx
                    ": Asm output not supported on this arch\n", pc);