Fix out of date assert after PropertyCell enterbung

R=verwaest@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1028393002

Cr-Commit-Position: refs/heads/master@{#27400}

src/objects.h

@@ -9699,7 +9699,7 @@ class Cell: public HeapObject {
 
   static inline Cell* FromValueAddress(Address value) {
     Object* result = FromAddress(value - kValueOffset);
-    DCHECK(result->IsCell() || result->IsPropertyCell());
+    DCHECK(result->IsCell());
     return static_cast<Cell*>(result);
   }