DBC: Fix CheckCids instruction

runtime/vm/simulator_dbc.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <setjmp.h>  // NOLINT
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_DBC)
 
@@ skipping 2863 matching lines @@
     const bool may_be_smi = (rB == 1);
     const intptr_t cids_length = rC;
     if (LIKELY(!is_smi)) {
       const intptr_t cid = SimulatorHelpers::GetClassId(FP[rA]);
       for (intptr_t i = 0; i < cids_length; i++) {
         const intptr_t desired_cid = Bytecode::DecodeD(*(pc + i));
         if (cid == desired_cid) {
           pc++;
           break;
         }
-        // The cids are sorted.
-        if (cid < desired_cid) {
+        // The cids are sorted in descending order.
+        if (cid > desired_cid) {
           break;
         }
       }
       pc += cids_length;
     } else {
       pc += cids_length;
       pc += (may_be_smi ? 1 : 0);
     }
     DISPATCH();
   }
@@ skipping 597 matching lines @@
   pc_ = pc;
   special_[kExceptionSpecialIndex] = raw_exception;
   special_[kStacktraceSpecialIndex] = raw_stacktrace;
   buf->Longjmp();
   UNREACHABLE();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC