- fix some cases where we are using uninitialized memory

runtime/vm/isolate.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 "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
@@ skipping 821 matching lines @@
       compilation_allowed_(true),
       all_classes_finalized_(false),
       next_(NULL),
       pause_loop_monitor_(NULL),
       loading_invalidation_gen_(kInvalidGen),
       top_level_parsing_count_(0),
       field_list_mutex_(new Mutex()),
       boxed_field_list_(GrowableObjectArray::null()),
       spawn_count_monitor_(new Monitor()),
       spawn_count_(0),
+#define ISOLATE_METRIC_CONSTRUCTORS(type, variable, name, unit)                \
+      metric_##variable##_(),
+      ISOLATE_METRIC_LIST(ISOLATE_METRIC_CONSTRUCTORS)
+#undef ISOLATE_METRIC_CONSTRUCTORS
       has_attempted_reload_(false),
       no_reload_scope_depth_(0),
       reload_every_n_stack_overflow_checks_(FLAG_reload_every),
       reload_context_(NULL),
       last_reload_timestamp_(OS::GetCurrentTimeMillis()) {
   NOT_IN_PRODUCT(FlagsCopyFrom(api_flags));
   // TODO(asiva): A Thread is not available here, need to figure out
   // how the vm_tag (kEmbedderTagId) can be set, these tags need to
   // move to the OSThread structure.
   set_user_tag(UserTags::kDefaultUserTag);
@@ skipping 2051 matching lines @@
 void IsolateSpawnState::DecrementSpawnCount() {
   ASSERT(spawn_count_monitor_ != NULL);
   ASSERT(spawn_count_ != NULL);
   MonitorLocker ml(spawn_count_monitor_);
   ASSERT(*spawn_count_ > 0);
   *spawn_count_ = *spawn_count_ - 1;
   ml.Notify();
 }
 
 }  // namespace dart