Expose a lower bound of malloc'd memory via heap statistics

src/background-parsing-task.cc

Index: src/background-parsing-task.cc
diff --git a/src/background-parsing-task.cc b/src/background-parsing-task.cc
index 3142626280de7ebee5d8e6dfc1080a567d3f282d..3e0a5dcc424509be64d77c6322a05c1b4bca4dba 100644
--- a/src/background-parsing-task.cc
+++ b/src/background-parsing-task.cc
@@ -21,7 +21,7 @@ BackgroundParsingTask::BackgroundParsingTask(
 
   // Prepare the data for the internalization phase and compilation phase, which
   // will happen in the main thread after parsing.
-  Zone* zone = new Zone();
+  Zone* zone = new Zone(isolate->allocator());
   ParseInfo* info = new ParseInfo(zone);
   source->zone.Reset(zone);
   source->info.Reset(info);