Reland "Merge cellspace into old pointer space"

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 0e4ed866a9d04213780b242ef13d781c79c3f5fa..e8384722aef6a852546b4187803930e1b5d513aa 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -412,13 +412,12 @@ enum AllocationSpace {
   OLD_SPACE,   // May contain pointers to new space.
   CODE_SPACE,  // No pointers to new space, marked executable.
   MAP_SPACE,   // Only and all map objects.
-  CELL_SPACE,  // Only and all cell objects.
   LO_SPACE,    // Promoted large objects.
 
   FIRST_SPACE = NEW_SPACE,
   LAST_SPACE = LO_SPACE,
   FIRST_PAGED_SPACE = OLD_SPACE,
-  LAST_PAGED_SPACE = CELL_SPACE
+  LAST_PAGED_SPACE = MAP_SPACE
 };
 const int kSpaceTagSize = 3;
 const int kSpaceTagMask = (1 << kSpaceTagSize) - 1;