Merge r8833 "Minimize malloc heap allocation on process startup" to 3.2.

src/debug.cc

Index: src/debug.cc
===================================================================
--- src/debug.cc	(revision 8834)
+++ src/debug.cc	(working copy)
@@ -1986,8 +1986,8 @@
 }
 
 
-Debugger::Debugger()
-    : debugger_access_(OS::CreateMutex()),
+Debugger::Debugger(Isolate* isolate)
+    : debugger_access_(isolate->debugger_access()),
       event_listener_(Handle<Object>()),
       event_listener_data_(Handle<Object>()),
       compiling_natives_(false),
@@ -2003,13 +2003,12 @@
       agent_(NULL),
       command_queue_(kQueueInitialSize),
       command_received_(OS::CreateSemaphore(0)),
-      event_command_queue_(kQueueInitialSize) {
+      event_command_queue_(kQueueInitialSize),
+      isolate_(isolate) {
 }
 
 
 Debugger::~Debugger() {
-  delete debugger_access_;
-  debugger_access_ = 0;
   delete dispatch_handler_access_;
   dispatch_handler_access_ = 0;
   delete command_received_;