ICData::NumberOfChecks is O(n) so don't call it in loops

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "lib/stacktrace.h"
@@ skipping 6555 matching lines @@
 
             JSONObject js_icdata(&js_icdatas);
             js_icdata.AddProperty("deoptId", ic_data_.deopt_id());
             name_ = ic_data_.target_name();
             name_ = String::RemovePrivateKey(name_);
             js_icdata.AddProperty("selector", name_.ToCString());
             js_icdata.AddProperty("isStaticCall", ic_data_.is_static_call());
             intptr_t num_args_checked = ic_data_.NumArgsTested();
             js_icdata.AddProperty("argsTested", num_args_checked);
             JSONArray js_entries(&js_icdata, "entries");
-            for (intptr_t check = 0; check < ic_data_.NumberOfChecks();
-                 check++) {
+            intptr_t number_of_checks = ic_data_.NumberOfChecks();
+            for (intptr_t check = 0; check < number_of_checks; check++) {
               GrowableArray<intptr_t> class_ids(num_args_checked);
               ic_data_.GetClassIdsAt(check, &class_ids);
               for (intptr_t k = 0; k < num_args_checked; k++) {
                 ASSERT(class_ids[k] != kIllegalCid);
                 js_entries.AddValue(class_ids[k]);
               }
               js_entries.AddValue(ic_data_.GetCountAt(check));
             }
           }
         }
@@ skipping 248 matching lines @@
 }
 
 
 DART_EXPORT void Dart_DumpNativeStackTrace(void* context) {
 #ifndef PRODUCT
   Profiler::DumpStackTrace(context);
 #endif
 }
 
 }  // namespace dart