Add stricter assertions on CC access

Author: jhawthorn

vm_callinfo.h

@@ -418,6 +418,8 @@ static inline const struct rb_callable_method_entry_struct *
 vm_cc_cme(const struct rb_callcache *cc)
 {
     VM_ASSERT(IMEMO_TYPE_P(cc, imemo_callcache));
+    VM_ASSERT(cc->klass != Qundef || !vm_cc_markable(cc));
+    VM_ASSERT(cc_check_class(cc->klass));
     VM_ASSERT(cc->call_ == NULL   || // not initialized yet
               !vm_cc_markable(cc) ||
               cc->cme_ != NULL);
@@ -430,6 +432,8 @@ vm_cc_call(const struct rb_callcache *cc)
 {
     VM_ASSERT(IMEMO_TYPE_P(cc, imemo_callcache));
     VM_ASSERT(cc->call_ != NULL);
+    VM_ASSERT(cc->klass != Qundef || !vm_cc_markable(cc));
+    VM_ASSERT(cc_check_class(cc->klass));
     return cc->call_;
 }