Fix Issue 23882 - ICE (segfault) on nasty alias this code

[RazvanN7]

No description provided.

[dlang-bot]

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	23882	regression	ICE (segfault) on nasty alias this code

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "stable + dmd#15177"

[dkorpel]

stable?

[RazvanN7]

Yeah, sorry, I did rebase on stable, just forgot to change the branch from the github interface.

[RazvanN7]

forced push to restart the canceled CIs