Introduce IsUndefined(Isolate*) and IsTheHole(Isolate*)

src/runtime/runtime-collections.cc

Index: src/runtime/runtime-collections.cc
diff --git a/src/runtime/runtime-collections.cc b/src/runtime/runtime-collections.cc
index 65690dfe778b3eba93cf7e1ab352c604066ba948..e6efbf82e1c153349b9af5e4209a09f5320c2e3a 100644
--- a/src/runtime/runtime-collections.cc
+++ b/src/runtime/runtime-collections.cc
@@ -291,7 +291,8 @@ RUNTIME_FUNCTION(Runtime_WeakCollectionGet) {
       ObjectHashTable::cast(weak_collection->table()));
   RUNTIME_ASSERT(table->IsKey(*key));
   Handle<Object> lookup(table->Lookup(key, hash), isolate);
-  return lookup->IsTheHole() ? isolate->heap()->undefined_value() : *lookup;
+  return lookup->IsTheHole(isolate) ? isolate->heap()->undefined_value()
+                                    : *lookup;
 }
 
 
@@ -306,7 +307,7 @@ RUNTIME_FUNCTION(Runtime_WeakCollectionHas) {
       ObjectHashTable::cast(weak_collection->table()));
   RUNTIME_ASSERT(table->IsKey(*key));
   Handle<Object> lookup(table->Lookup(key, hash), isolate);
-  return isolate->heap()->ToBoolean(!lookup->IsTheHole());
+  return isolate->heap()->ToBoolean(!lookup->IsTheHole(isolate));
 }