Revert r1900, r1897 and r1895 which are all gc changes. The changes...

src/spaces.cc

Index: src/spaces.cc
===================================================================
--- src/spaces.cc	(revision 1910)
+++ src/spaces.cc	(working copy)
@@ -111,17 +111,17 @@
 // -----------------------------------------------------------------------------
 // PageIterator
 
-PageIterator::PageIterator(PagedSpace* space, Mode mode) : space_(space) {
-  prev_page_ = NULL;
+PageIterator::PageIterator(PagedSpace* space, Mode mode) {
+  cur_page_ = space->first_page_;
   switch (mode) {
     case PAGES_IN_USE:
-      stop_page_ = space->AllocationTopPage();
+      stop_page_ = space->AllocationTopPage()->next_page();
       break;
     case PAGES_USED_BY_MC:
-      stop_page_ = space->MCRelocationTopPage();
+      stop_page_ = space->MCRelocationTopPage()->next_page();
       break;
     case ALL_PAGES:
-      stop_page_ = space->last_page_;
+      stop_page_ = Page::FromAddress(NULL);
       break;
     default:
       UNREACHABLE();
@@ -496,11 +496,8 @@
   accounting_stats_.ExpandSpace(num_pages * Page::kObjectAreaSize);
   ASSERT(Capacity() <= max_capacity_);
 
-  // Sequentially initialize remembered sets in the newly allocated
-  // pages and cache the current last page in the space.
   for (Page* p = first_page_; p->is_valid(); p = p->next_page()) {
     p->ClearRSet();
-    last_page_ = p;
   }
 
   // Use first_page_ for allocation.
@@ -679,11 +676,9 @@
 
   MemoryAllocator::SetNextPage(last_page, p);
 
-  // Sequentially clear remembered set of new pages and and cache the
-  // new last page in the space.
+  // Clear remembered set of new pages.
   while (p->is_valid()) {
     p->ClearRSet();
-    last_page_ = p;
     p = p->next_page();
   }
 
@@ -728,12 +723,10 @@
   Page* p = MemoryAllocator::FreePages(last_page_to_keep->next_page());
   MemoryAllocator::SetNextPage(last_page_to_keep, p);
 
-  // Since pages are only freed in whole chunks, we may have kept more
-  // than pages_to_keep.  Count the extra pages and cache the new last
-  // page in the space.
+  // Since pages are only freed in whole chunks, we may have kept more than
+  // pages_to_keep.
   while (p->is_valid()) {
     pages_to_keep++;
-    last_page_ = p;
     p = p->next_page();
   }