[CSA][cleanup] TNodify builtins collections gen (pt. 2/2)

Follow-up CL that finishes TNodifying builtins collection gen.

Added a TODO in CSA since I was encountering errors when trying to
return a JSIteratorResult.

Bug: v8:6949, v8:9396
Change-Id: I1e8a9cf8bce54327dd1fad5bd9531058f096469d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1803344
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63766}

src/codegen/code-stub-assembler.cc

@@ -13428,9 +13428,8 @@ TNode<JSObject> CodeStubAssembler::AllocateJSIteratorResult(
   return CAST(result);
 }
 
-Node* CodeStubAssembler::AllocateJSIteratorResultForEntry(Node* context,
-                                                          Node* key,
-                                                          Node* value) {
+TNode<JSObject> CodeStubAssembler::AllocateJSIteratorResultForEntry(
+    TNode<Context> context, TNode<Object> key, SloppyTNode<Object> value) {
   TNode<NativeContext> native_context = LoadNativeContext(context);
   TNode<Smi> length = SmiConstant(2);
   int const elements_size = FixedArray::SizeFor(2);
@@ -13460,7 +13459,7 @@ Node* CodeStubAssembler::AllocateJSIteratorResultForEntry(Node* context,
   StoreObjectFieldNoWriteBarrier(result, JSIteratorResult::kValueOffset, array);
   StoreObjectFieldRoot(result, JSIteratorResult::kDoneOffset,
                        RootIndex::kFalseValue);
-  return result;
+  return CAST(result);
 }
 
 TNode<JSReceiver> CodeStubAssembler::ArraySpeciesCreate(TNode<Context> context,

src/codegen/code-stub-assembler.h

@@ -1929,10 +1929,15 @@ class V8_EXPORT_PRIVATE CodeStubAssembler
                                              TNode<Object> object,
                                              IterationKind mode);
 
+  // TODO(v8:9722): Return type should be JSIteratorResult
   TNode<JSObject> AllocateJSIteratorResult(SloppyTNode<Context> context,
                                            SloppyTNode<Object> value,
                                            SloppyTNode<Oddball> done);
-  Node* AllocateJSIteratorResultForEntry(Node* context, Node* key, Node* value);
+
+  // TODO(v8:9722): Return type should be JSIteratorResult
+  TNode<JSObject> AllocateJSIteratorResultForEntry(TNode<Context> context,
+                                                   TNode<Object> key,
+                                                   SloppyTNode<Object> value);
 
   TNode<JSReceiver> ArraySpeciesCreate(TNode<Context> context,
                                        TNode<Object> originalArray,