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

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index ea25bdb69869208c12021b3c6ba1bf4e663efd56..6d8a13be20b001f4c8cf6f6da5a0f02d6d859e7a 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1212,12 +1212,12 @@ void Heap::ClearNormalizedMapCaches() {
   }
 
   Object* context = native_contexts_list();
-  while (!context->IsUndefined()) {
+  while (!context->IsUndefined(isolate())) {
     // GC can happen when the context is not fully initialized,
     // so the cache can be undefined.
     Object* cache =
         Context::cast(context)->get(Context::NORMALIZED_MAP_CACHE_INDEX);
-    if (!cache->IsUndefined()) {
+    if (!cache->IsUndefined(isolate())) {
       NormalizedMapCache::cast(cache)->Clear();
     }
     context = Context::cast(context)->next_context_link();