Fix for issue 28638 - flakiness on dartkp-dart-precompiled caused by MallocHooks

runtime/vm/service.cc

Index: runtime/vm/service.cc
diff --git a/runtime/vm/service.cc b/runtime/vm/service.cc
index 66c7abec3ac3f98a02ec7d45f701cbc9db47a488..3353228e860062b857f37fb48ecf4f20621393a8 100644
--- a/runtime/vm/service.cc
+++ b/runtime/vm/service.cc
@@ -3802,11 +3802,7 @@ void Service::PrintJSONForVM(JSONStream* js, bool ref) {
   jsobj.AddProperty64("_maxRSS", OS::MaxRSS());
   jsobj.AddPropertyTimeMillis(
       "startTime", OS::GetCurrentTimeMillis() - Dart::UptimeMillis());
-  if (MallocHooks::Initialized()) {
-    jsobj.AddProperty("_heapAllocatedMemoryUsage",
-                      MallocHooks::heap_allocated_memory_in_bytes());
-    jsobj.AddProperty("_heapAllocationCount", MallocHooks::allocation_count());
-  }
+  MallocHooks::PrintToJSONObject(&jsobj);
   // Construct the isolate list.
   {
     JSONArray jsarr(&jsobj, "isolates");