Genhl compiler failure when using hxb

```
| Error: Compiler failure
| Please submit an issue at https://github.com/HaxeFoundation/haxe/issues/new
| Attach the following information:
| Haxe: 5.0.0-alpha.1+dbba36c; OS type: unix;
| File "src/generators/genhl.ml", line 764, characters 19-26
| Called from Genhl.class_type in file "src/generators/genhl.ml", line 689, characters 95-112
| Called from Genhl.class_global in file "src/generators/genhl.ml", line 780, characters 9-35
| Called from Genhl.class_type in file "src/generators/genhl.ml", line 702, characters 94-152
| Called from Genhl.get_rec_cache in file "src/generators/genhl.ml", line 378, characters 10-33
| Called from Genhl.make_fun in file "src/generators/genhl.ml", line 3267, characters 30-53
| Called from Genhl.generate_static.loop in file "src/generators/genhl.ml", line 3470, characters 45-126
| Called from Stdlib__List.iter in file "list.ml", line 112, characters 12-15
| Called from Genhl.generate_type in file "src/generators/genhl.ml", line 3547, characters 2-56
| Called from Stdlib__List.iter in file "list.ml", line 112, characters 12-15
| Called from Genhl.generate in file "src/generators/genhl.ml", line 4250, characters 1-24
| Called from Generate.generate in file "src/compiler/generate.ml", line 204, characters 3-15
| Called from Compiler.compile in file "src/compiler/compiler.ml", line 403, characters 29-64
| Called from Compiler.compile_safe in file "src/compiler/compiler.ml", line 419, characters 1-5
| Called from Compiler.compile_safe in file "src/compiler/compiler.ml", line 457, characters 5-23
| Called from Compiler.compile_ctx.run in file "src/compiler/compiler.ml", line 497, characters 2-131
| Called from Compiler.catch_completion_and_exit in file "src/compiler/compiler.ml", line 471, characters 2-9
| Called from Compiler.HighLevel.entry.loop in file "src/compiler/compiler.ml", line 694, characters 5-43
| Called from Compiler.HighLevel.entry in file "src/compiler/compiler.ml", line 706, characters 13-22
| Called from Server.process in file "src/compiler/server.ml", line 803, characters 1-39
| Called from Dune__exe__Haxe in file "src/compiler/haxe.ml", line 53, characters 0-56
```
Haxe: 5.0.0-alpha.1+dbba36c
Hashlink: 1.13.0