Fix another handful of memory leaks

TEST=valgrind reports 0 bytes definitely lost for cctest/test-api/RunTwoIsolatesOnSingleThread

Review URL: http://codereview.chromium.org/7621064

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8968 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/isolate.cc

@@ -1573,6 +1573,8 @@ Isolate::~Isolate() {
   handle_scope_implementer_ = NULL;
   delete break_access_;
   break_access_ = NULL;
+  delete debugger_access_;
+  debugger_access_ = NULL;
 
   delete compilation_cache_;
   compilation_cache_ = NULL;

src/spaces.h

@@ -409,6 +409,7 @@ class Space : public Malloced {
 class CodeRange {
  public:
   explicit CodeRange(Isolate* isolate);
+  ~CodeRange() { TearDown(); }
 
   // Reserves a range of virtual memory, but does not commit any of it.
   // Can only be called once, at heap initialization time.

src/v8threads.cc

@@ -305,7 +305,9 @@ ThreadManager::ThreadManager()
 
 
 ThreadManager::~ThreadManager() {
-  // TODO(isolates): Destroy mutexes.
+  delete mutex_;
+  delete free_anchor_;
+  delete in_use_anchor_;
 }