.NET 6 R2R does not work with classes with umlauts in referenced assemblies

[MarkusRodler]

Description

Everything works with umlauts if they are in the same project but if they are in a different project then it constantly produces errors on run:
Unhandled exception. System.TypeLoadException: Could not load type 'Dummy.Umlautä' from assembly 'Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.

Reproduction Steps

I made a repo demonstrating this issue: https://github.com/MarkusRodler/r2r-umlauts-issue

In essence:

1. Create a new project
2. Enable R2R <PublishReadyToRun>true</PublishReadyToRun>
3. Create a shared project and reference it
4. Create a class in the shared project containing umlauts public record Umlautä();
5. Instantiate the class in the projects Program.cs
6. Publish it succesfully
7. Run it with errors

Expected behavior

No TypeLoadException errors on run.

Actual behavior

TypeLoadException errors on run

Regression?

No response

Known Workarounds

No response

Configuration

.NET 6
alpine-x64

Other information

No response

[MichalStrehovsky]

Looks related to #61104. If I had to guess, something might be off with computing type name hash codes in ReadyToRunHashCode.

Cc @dotnet/crossgen-contrib

[mangod9]

@trylek assume your fix resolves this issue as well?

[trylek]

@mangod9 - Yes, I believe my fix should fix this issue too, in fact the regression test I created in that PR does include umlaut characters in the type name.

[MarkusRodler]

Yes this works. Thanks!

[trylek]

Thanks Markus for confirming your issue is fixed now and for reaching out in the first place!