[maglev] Support GetSuperConstructor

Bug: v8:7700
Change-Id: Ib3325ff8f764f7a3bd6c064a5ad301c384503d99
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3784594
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81917}

src/maglev/maglev-graph-builder.cc

@@ -1323,7 +1323,15 @@ void MaglevGraphBuilder::VisitLogicalNot() {
 MAGLEV_UNIMPLEMENTED_BYTECODE(TypeOf)
 MAGLEV_UNIMPLEMENTED_BYTECODE(DeletePropertyStrict)
 MAGLEV_UNIMPLEMENTED_BYTECODE(DeletePropertySloppy)
-MAGLEV_UNIMPLEMENTED_BYTECODE(GetSuperConstructor)
+
+void MaglevGraphBuilder::VisitGetSuperConstructor() {
+  ValueNode* active_function = GetAccumulatorTagged();
+  ValueNode* map =
+      AddNewNode<LoadTaggedField>({active_function}, HeapObject::kMapOffset);
+  ValueNode* map_proto =
+      AddNewNode<LoadTaggedField>({map}, Map::kPrototypeOffset);
+  StoreRegister(iterator_.GetRegisterOperand(0), map_proto);
+}
 
 void MaglevGraphBuilder::InlineCallFromRegisters(
     int argc_count, ConvertReceiverMode receiver_mode,