[hash-table] Make a few accessor definitions more readable

Change-Id: I10dd526c0ec1bee9c049b8a2a352908357bb302a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2534812
Commit-Queue: Georg Neis <neis@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71158}

src/objects/hash-table-inl.h

@@ -71,18 +71,15 @@ void EphemeronHashTable::set_key(int index, Object value,
 }
 
 int HashTableBase::NumberOfElements() const {
-  int offset = OffsetOfElementAt(kNumberOfElementsIndex);
-  return TaggedField<Smi>::load(*this, offset).value();
+  return Smi::cast(get(kNumberOfElementsIndex)).value();
 }
 
 int HashTableBase::NumberOfDeletedElements() const {
-  int offset = OffsetOfElementAt(kNumberOfDeletedElementsIndex);
-  return TaggedField<Smi>::load(*this, offset).value();
+  return Smi::cast(get(kNumberOfDeletedElementsIndex)).value();
 }
 
 int HashTableBase::Capacity() const {
-  int offset = OffsetOfElementAt(kCapacityIndex);
-  return TaggedField<Smi>::load(*this, offset).value();
+  return Smi::cast(get(kCapacityIndex)).value();
 }
 
 InternalIndex::Range HashTableBase::IterateEntries() const {