[Issue 21532] dtoh: Forward-referencing issues for type aliases and templates

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21532

moonlightsentinel at disroot.org changed:

           What    |Removed                     |Added
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                 CC|                            |moonlightsentinel at disroot.o
                   |                            |rg

--- Comment #1 from moonlightsentinel at disroot.org ---
Most of these issues will be resolved https://github.com/dlang/dmd/pull/12678.

Type aliases in template declarations re more complicated because dtoh will
need to resolve the alias from the TypeIdentifier

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