diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index b023b03..a8728fc 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -99,6 +99,7 @@
       Oddball::cast(this)->OddballVerify();
       break;
     case JS_OBJECT_TYPE:
+    case JS_API_OBJECT_TYPE:
     case JS_SPECIAL_API_OBJECT_TYPE:
     case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
     case JS_PROMISE_TYPE:
@@ -209,7 +210,7 @@
 void Symbol::SymbolVerify() {
   CHECK(IsSymbol());
   CHECK(HasHashCode());
-  CHECK(GetHeap()->hidden_properties_symbol() == this || Hash() > 0u);
+  CHECK(Hash() > 0u);
   CHECK(name()->IsUndefined() || name()->IsString());
 }
 
@@ -369,21 +370,6 @@
 }
 
 
-void CodeCache::CodeCacheVerify() {
-  VerifyHeapPointer(default_cache());
-  VerifyHeapPointer(normal_type_cache());
-  CHECK(default_cache()->IsFixedArray());
-  CHECK(normal_type_cache()->IsUndefined()
-         || normal_type_cache()->IsCodeCacheHashTable());
-}
-
-
-void PolymorphicCodeCache::PolymorphicCodeCacheVerify() {
-  VerifyHeapPointer(cache());
-  CHECK(cache()->IsUndefined() || cache()->IsPolymorphicCodeCacheHashTable());
-}
-
-
 void TypeFeedbackInfo::TypeFeedbackInfoVerify() {
   VerifyObjectField(kStorage1Offset);
   VerifyObjectField(kStorage2Offset);
@@ -623,7 +609,7 @@
     CHECK(number->IsSmi());
     int value = Smi::cast(number)->value();
     // Hidden oddballs have negative smis.
-    const int kLeastHiddenOddballNumber = -6;
+    const int kLeastHiddenOddballNumber = -7;
     CHECK_LE(value, 1);
     CHECK(value >= kLeastHiddenOddballNumber);
   }
@@ -648,6 +634,8 @@
     CHECK(this == heap->exception());
   } else if (map() == heap->optimized_out_map()) {
     CHECK(this == heap->optimized_out());
+  } else if (map() == heap->stale_register_map()) {
+    CHECK(this == heap->stale_register());
   } else {
     UNREACHABLE();
   }
@@ -921,6 +909,7 @@
   VerifyPointer(expected_receiver_type());
   VerifyPointer(getter());
   VerifyPointer(setter());
+  VerifyPointer(js_getter());
   VerifyPointer(data());
 }