disas: QOMify alpha specific disas setup

Move the target_disas() alpha specifics to the CPUClass::disas_set_info()
hook and delete the #ifdef specific code in disas.c.

This also makes monitor_disas() consistent with target_disas(), as
monitor_disas() was missing a set of the BFD (This was an omission from
commit b9bec751c8c8b08d8055da32306eb105db03031b).

Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Acked-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andreas Färber <afaerber@suse.de>

disas.c

@@ -230,9 +230,6 @@ void target_disas(FILE *out, CPUState *cpu, target_ulong code,
     }
     s.info.disassembler_options = (char *)"any";
     s.info.print_insn = print_insn_ppc;
-#elif defined(TARGET_ALPHA)
-    s.info.mach = bfd_mach_alpha_ev6;
-    s.info.print_insn = print_insn_alpha;
 #endif
     if (s.info.print_insn == NULL) {
         s.info.print_insn = print_insn_od_target;
@@ -404,8 +401,6 @@ void monitor_disas(Monitor *mon, CPUState *cpu,
         s.info.mach = bfd_mach_i386_i386;
     }
     s.info.print_insn = print_insn_i386;
-#elif defined(TARGET_ALPHA)
-    s.info.print_insn = print_insn_alpha;
 #elif defined(TARGET_PPC)
     if (flags & 0xFFFF) {
         /* If we have a precise definition of the instruction set, use it. */

target-alpha/cpu.c

@@ -46,6 +46,12 @@ static bool alpha_cpu_has_work(CPUState *cs)
                                     | CPU_INTERRUPT_MCHK);
 }
 
+static void alpha_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
+{
+    info->mach = bfd_mach_alpha_ev6;
+    info->print_insn = print_insn_alpha;
+}
+
 static void alpha_cpu_realizefn(DeviceState *dev, Error **errp)
 {
     CPUState *cs = CPU(dev);
@@ -297,6 +303,8 @@ static void alpha_cpu_class_init(ObjectClass *oc, void *data)
     cc->get_phys_page_debug = alpha_cpu_get_phys_page_debug;
     dc->vmsd = &vmstate_alpha_cpu;
 #endif
+    cc->disas_set_info = alpha_cpu_disas_set_info;
+
     cc->gdb_num_core_regs = 67;
 
     /*