A64: Synchronize with r17807.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 6ab2ddffe2a9e0ea3772163e20e87bd269f1a7e0..ed93e1dc9e188ae1beea1f8114cecdf6642f468d 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -243,6 +243,7 @@ void Symbol::SymbolVerify() {
   CHECK(HasHashCode());
   CHECK_GT(Hash(), 0);
   CHECK(name()->IsUndefined() || name()->IsString());
+  CHECK(flags()->IsSmi());
 }
 
 
@@ -366,9 +367,6 @@ void Map::MapVerify() {
     SLOW_ASSERT(transitions()->IsSortedNoDuplicates());
     SLOW_ASSERT(transitions()->IsConsistentWithBackPointers(this));
   }
-  ASSERT(!is_observed() || instance_type() < FIRST_JS_OBJECT_TYPE ||
-         instance_type() > LAST_JS_OBJECT_TYPE ||
-         has_slow_elements_kind() || has_external_array_elements());
 }