disas: Prefer cached CpuClass over CPU_GET_CLASS() macro

CpuState caches its CPUClass since commit 6fbdff87062
("cpu: cache CPUClass in CPUState for hot code paths"),
use it.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250122093028.52416-8-philmd@linaro.org>

disas/disas-common.c

@@ -62,9 +62,8 @@ void disas_initialize_debug_target(CPUDebug *s, CPUState *cpu)
     s->info.print_address_func = print_address;
     s->info.endian = BFD_ENDIAN_UNKNOWN;
 
-    CPUClass *cc = CPU_GET_CLASS(cpu);
-    if (cc->disas_set_info) {
-        cc->disas_set_info(cpu, &s->info);
+    if (cpu->cc->disas_set_info) {
+        cpu->cc->disas_set_info(cpu, &s->info);
         g_assert(s->info.endian != BFD_ENDIAN_UNKNOWN);
     }
 }