Merge r3481 to branches/1.3 to increase the number of maps...

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 3546)
+++ src/heap.cc	(working copy)
@@ -1097,6 +1097,13 @@
   map->set_unused_property_fields(0);
   map->set_bit_field(0);
   map->set_bit_field2(0);
+
+  // If the map object is aligned fill the padding area with Smi 0 objects.
+  if (Map::kPadStart < Map::kSize) {
+    memset(reinterpret_cast<byte*>(map) + Map::kPadStart - kHeapObjectTag,
+           0,
+           Map::kSize - Map::kPadStart);
+  }
   return map;
 }