Add dump_symbol_stats to dump symbol table stats at the end of a test run

vm/isolate.cc

 // Copyright (c) 2012, 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 "platform/assert.h"
 #include "lib/mirrors.h"
 #include "vm/compiler_stats.h"
@@ skipping 434 matching lines @@
   if (FLAG_report_usage_count) {
     PrintInvokedFunctions();
   }
   CompilerStats::Print();
   if (FLAG_generate_gdb_symbols) {
     DebugInfo::UnregisterAllSections();
   }
   if (FLAG_trace_isolates) {
     StackZone zone(this);
     HandleScope handle_scope(this);
-    OS::Print("Number of symbols added = %"Pd"\n", Symbols::Size(this));
+    heap()->PrintSizes();
+    megamorphic_cache_table()->PrintSizes();
+    Symbols::DumpStats();
     OS::Print("[-] Stopping isolate:\n"
               "\tisolate:    %s\n", name());
   }
   // TODO(5411455): For now just make sure there are no current isolates
   // as we are shutting down the isolate.
   SetCurrent(NULL);
 }
 
 
 Dart_IsolateCreateCallback Isolate::create_callback_ = NULL;
@@ skipping 51 matching lines @@
 
 
 void Isolate::VisitWeakPersistentHandles(HandleVisitor* visitor,
                                          bool visit_prologue_weak_handles) {
   if (api_state() != NULL) {
     api_state()->VisitWeakHandles(visitor, visit_prologue_weak_handles);
   }
 }
 
 }  // namespace dart