Revert of Serializer: support all alignment kinds.

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index 4573da151279d68dab655dbf0cbd587a40c7c892..45303bd1460c8420ecae38921319e1f68292c591 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -641,7 +641,7 @@
   HInstruction* value = GetParameter(CreateWeakCellDescriptor::kValueIndex);
   Add<HStoreNamedField>(object, HObjectAccess::ForWeakCellValue(), value);
   Add<HStoreNamedField>(object, HObjectAccess::ForWeakCellNext(),
-                        graph()->GetConstantHole());
+                        graph()->GetConstantUndefined());
 
   HInstruction* feedback_vector =
       GetParameter(CreateWeakCellDescriptor::kVectorIndex);