[elements] Avoid using IsKey in loops

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 92487371e32efa8f1caab4e3d6fb3bf8ce1e46ef..01d8f6b57969271e720b6ca0e63220142fc9b843 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -3211,6 +3211,7 @@ class HashTableBase : public FixedArray {
   // Tells whether k is a real key.  The hole and undefined are not allowed
   // as keys and can be used to indicate missing or deleted elements.
   inline bool IsKey(Object* k);
+  inline bool IsKey(Heap* heap, Object* k);
 
   // Compute the probe offset (quadratic probing).
   INLINE(static uint32_t GetProbeOffset(uint32_t n)) {