[builtins] Improve performance of array.prototype.filter and map

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 99d1996629aee022d84d7b90664e08726b9cac28..b18300423e8f1559166c591b87c40bb10f944e7d 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -498,9 +498,21 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
       Node* object, Node* index, Node* value,
       ParameterMode parameter_mode = INTPTR_PARAMETERS);
 
-  Node* BuildAppendJSArray(ElementsKind kind, Node* context, Node* array,
+  // EnsureArrayPushable verifies that receiver is:
+  //   1. Is not a prototype.
+  //   2. Is not a dictionary.
+  //   3. Has a writeable length property.
+  // It returns ElementsKind as a node for further division into cases.
+  Node* EnsureArrayPushable(Node* receiver, Label* bailout);
+
+  void TryStoreArrayElement(ElementsKind kind, ParameterMode mode,
+                            Label* bailout, Node* elements, Node* index,
+                            Node* value);
+  Node* BuildAppendJSArray(ElementsKind kind, Node* array,
                            CodeStubArguments& args, Variable& arg_index,
                            Label* bailout);
+  Node* BuildAppendJSArray(ElementsKind kind, Node* array, Node* value,
+                           Label* bailout);
 
   void StoreFieldsNoWriteBarrier(Node* start_address, Node* end_address,
                                  Node* value);