Reland parts of 'Use weak cells in map checks in polymorphic ICs'

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 218d3b9625880164cc77add838d537432871f628..4680e75204b30bf91770ab04333fa9fcdd7b94d0 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -802,6 +802,7 @@ Handle<CodeCache> Factory::NewCodeCache() {
       Handle<CodeCache>::cast(NewStruct(CODE_CACHE_TYPE));
   code_cache->set_default_cache(*empty_fixed_array(), SKIP_WRITE_BARRIER);
   code_cache->set_normal_type_cache(*undefined_value(), SKIP_WRITE_BARRIER);
+  code_cache->set_weak_cell_cache(*undefined_value(), SKIP_WRITE_BARRIER);
   return code_cache;
 }