i386/cpu: Move adjustment of CPUID_EXT_PDCM before feature_dependencies[] check

There is one entry relates to CPUID_EXT_PDCM in feature_dependencies[].
So it needs to get correct value of CPUID_EXT_PDCM before using
feature_dependencies[] to apply dependencies.

Besides, it also ensures CPUID_EXT_PDCM value is tracked in
env->features[FEAT_1_ECX].

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250304052450.465445-2-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/cpu.c

@@ -7349,9 +7349,6 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
         if (threads_per_pkg > 1) {
             *ebx |= threads_per_pkg << 16;
         }
-        if (!cpu->enable_pmu) {
-            *ecx &= ~CPUID_EXT_PDCM;
-        }
         break;
     case 2:
         /* cache info: needed for Pentium Pro compatibility */
@@ -8341,6 +8338,10 @@ void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
         }
     }
 
+    if (!cpu->enable_pmu) {
+        env->features[FEAT_1_ECX] &= ~CPUID_EXT_PDCM;
+    }
+
     for (i = 0; i < ARRAY_SIZE(feature_dependencies); i++) {
         FeatureDep *d = &feature_dependencies[i];
         if (!(env->features[d->from.index] & d->from.mask)) {