Ensure double alignment when deserializing.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 0e670993e0d965f2624f6cff9b581bfe5bcacda8..e49b47cc5cfa8f20d3b68f838999b837c268f25b 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -47,6 +47,10 @@ void HeapObject::HeapObjectVerify() {
     return;
   }
 
+  // TODO(yangguo): Use this check once crbug/436911 has been fixed.
+  //  DCHECK(!NeedsToEnsureDoubleAlignment() ||
+  //         IsAligned(OffsetFrom(address()), kDoubleAlignment));
+
   switch (instance_type) {
     case SYMBOL_TYPE:
       Symbol::cast(this)->SymbolVerify();