Get rid of distinction between below- and above-watermark in page allocation....

src/debug.cc

Index: src/debug.cc
===================================================================
--- src/debug.cc	(revision 7216)
+++ src/debug.cc	(working copy)
@@ -1875,9 +1875,10 @@
 
   // Perform two GCs to get rid of all unreferenced scripts. The first GC gets
   // rid of all the cached script wrappers and the second gets rid of the
-  // scripts which are no longer referenced.
-  Heap::CollectAllGarbage(false);
-  Heap::CollectAllGarbage(false);
+  // scripts which are no longer referenced.  The second also sweeps precisely,
+  // which saves us doing yet another GC to make the heap iterable.
+  Heap::CollectAllGarbage(Heap::kNoGCFlags);
+  Heap::CollectAllGarbage(Heap::kMakeHeapIterableMask);
 
   ASSERT(script_cache_ == NULL);
   script_cache_ = new ScriptCache();
@@ -1885,7 +1886,7 @@
   // Scan heap for Script objects.
   int count = 0;
   HeapIterator iterator;
-  for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
+  for (HeapObject* obj = iterator.Next(); obj != NULL; obj = iterator.Next()) {
     if (obj->IsScript() && Script::cast(obj)->HasValidSource()) {
       script_cache_->Add(Handle<Script>(Script::cast(obj)));
       count++;
@@ -1925,7 +1926,7 @@
 
   // Perform GC to get unreferenced scripts evicted from the cache before
   // returning the content.
-  Heap::CollectAllGarbage(false);
+  Heap::CollectAllGarbage(Heap::kNoGCFlags);
 
   // Get the scripts from the cache.
   return script_cache_->GetScripts();