Fix the last memory leak demonstrated by the test program in

http://code.google.com/p/v8/issues/detail?id=444
Review URL: http://codereview.chromium.org/243027

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2978 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.h

@@ -369,6 +369,9 @@ class HandleScopeImplementer {
     ASSERT(blocks_.length() == 0);
     ASSERT(entered_contexts_.length() == 0);
     ASSERT(saved_contexts_.length() == 0);
+    blocks_.Free();
+    entered_contexts_.Free();
+    saved_contexts_.Free();
     if (spare_ != NULL) {
       DeleteArray(spare_);
       spare_ = NULL;

src/list.h

@@ -51,6 +51,13 @@ class List {
   INLINE(explicit List(int capacity)) { Initialize(capacity); }
   INLINE(~List()) { DeleteData(data_); }
 
+  // Deallocates memory used by the list and leaves the list in a consistent
+  // empty state.
+  void Free() {
+    DeleteData(data_);
+    Initialize(0);
+  }
+
   INLINE(void* operator new(size_t size)) { return P::New(size); }
   INLINE(void operator delete(void* p, size_t)) { return P::Delete(p); }