[dictionaries] Use IsKey(Isolate* i, Object* o) everywhere

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 6423a17d4144c012dc40a786d6e468398c8aff88..3b336dfb3ebfa32438f20a342b17f3ff80625397 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -3052,7 +3052,8 @@ int HashTableBase::ComputeCapacity(int at_least_space_for) {
   return Max(capacity, kMinCapacity);
 }
 
-bool HashTableBase::IsKey(Heap* heap, Object* k) {
+bool HashTableBase::IsKey(Isolate* isolate, Object* k) {
+  Heap* heap = isolate->heap();
   return k != heap->the_hole_value() && k != heap->undefined_value();
 }