[builtins] Introduce DeleteProperty builtin

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 4d45576b663fd76d6c1755bb3dfed9f2b9df2af4..93b6cc3ab59ca72b5cb013320bdd3e665a0da1aa 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -1000,16 +1000,34 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   Node* HashTableComputeCapacity(Node* at_least_space_for);
 
   template <class Dictionary>
-  Node* GetNumberOfElements(Node* dictionary);
+  Node* GetNumberOfElements(Node* dictionary) {
+    return LoadFixedArrayElement(dictionary,
+                                 Dictionary::kNumberOfElementsIndex);
+  }
 
   template <class Dictionary>
-  void SetNumberOfElements(Node* dictionary, Node* num_elements_smi);
+  void SetNumberOfElements(Node* dictionary, Node* num_elements_smi) {
+    StoreFixedArrayElement(dictionary, Dictionary::kNumberOfElementsIndex,
+                           num_elements_smi, SKIP_WRITE_BARRIER);
+  }
 
   template <class Dictionary>
-  Node* GetNumberOfDeletedElements(Node* dictionary);
+  Node* GetNumberOfDeletedElements(Node* dictionary) {
+    return LoadFixedArrayElement(dictionary,
+                                 Dictionary::kNumberOfDeletedElementsIndex);
+  }
 
   template <class Dictionary>
-  Node* GetCapacity(Node* dictionary);
+  void SetNumberOfDeletedElements(Node* dictionary, Node* num_deleted_smi) {
+    StoreFixedArrayElement(dictionary,
+                           Dictionary::kNumberOfDeletedElementsIndex,
+                           num_deleted_smi, SKIP_WRITE_BARRIER);
+  }
+
+  template <class Dictionary>
+  Node* GetCapacity(Node* dictionary) {
+    return LoadFixedArrayElement(dictionary, Dictionary::kCapacityIndex);
+  }
 
   template <class Dictionary>
   Node* GetNextEnumerationIndex(Node* dictionary);
@@ -1345,6 +1363,9 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   void DescriptorLookupBinary(Node* unique_name, Node* descriptors, Node* nof,
                               Label* if_found, Variable* var_name_index,
                               Label* if_not_found);
+  // Implements DescriptorArray::ToKeyIndex.
+  // Returns an untagged IntPtr.
+  Node* DescriptorArrayToKeyIndex(Node* descriptor_number);
 
   Node* CallGetterIfAccessor(Node* value, Node* details, Node* context,
                              Node* receiver, Label* if_bailout);
@@ -1388,9 +1409,6 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   // Implements DescriptorArray::number_of_entries.
   // Returns an untagged int32.
   Node* DescriptorArrayNumberOfEntries(Node* descriptors);
-  // Implements DescriptorArray::ToKeyIndex.
-  // Returns an untagged IntPtr.
-  Node* DescriptorArrayToKeyIndex(Node* descriptor_number);
   // Implements DescriptorArray::GetSortedKeyIndex.
   // Returns an untagged int32.
   Node* DescriptorArrayGetSortedKeyIndex(Node* descriptors,