Reintroducing MallocHooks changes with fix for infinite loop in MallocHooks on Platform::Exit.

runtime/bin/BUILD.gn

 # Copyright (c) 2014, 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.
 
 import("gypi_contents.gni")
 import("../runtime_args.gni")
 
 # Generate a resources.cc file for the service isolate without Observatory.
 action("gen_resources_cc") {
   visibility = [ ":*" ]  # Only targets in this file can see this.
@@ skipping 279 matching lines @@
     # Very limited native resolver provided.
     "builtin_common.cc",
     "builtin_gen_snapshot.cc",
     "gen_snapshot.cc",
     "vmservice_impl.cc",
     "vmservice_impl.h",
   ]
 
   include_dirs = [ ".." ]
 
+  if (dart_use_tcmalloc) {
+    deps += [ "//third_party/tcmalloc" ]
+  }
+
   if (is_mac) {
     libs = [
       "CoreFoundation.framework",
       "CoreServices.framework",
     ]
   }
 
   if (is_win) {
     libs = [
       "iphlpapi.lib",
@@ skipping 257 matching lines @@
              ":gen_resources_cc",
              ":standalone_dart_io",
              ":libdart_builtin",
              "$dart_zlib_path",
            ] + extra_deps
 
     defines = extra_defines
 
     if (dart_use_tcmalloc) {
       deps += [ "//third_party/tcmalloc" ]
-      defines += [ "DART_USE_TCMALLOC" ]
     }
 
     sources = [
                 "main.cc",
                 "vmservice_impl.cc",
                 "vmservice_impl.h",
                 "$target_gen_dir/resources_gen.cc",
               ] + extra_sources
 
     include_dirs = [
@@ skipping 252 matching lines @@
   defines = [
     # The only effect of DART_SHARED_LIB is to export the Dart API.
     "DART_SHARED_LIB",
   ]
   if (is_win) {
     libs = [ "dart.lib" ]
     abs_root_out_dir = rebase_path(root_out_dir)
     ldflags = [ "/LIBPATH:$abs_root_out_dir" ]
   }
 }