[Issue 23089] New: Linkage-related ICE regression in v2.100.0-rc.1

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23089

          Issue ID: 23089
           Summary: Linkage-related ICE regression in v2.100.0-rc.1
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: kinke at gmx.net

This crashes v2.100.0-rc.1+:

```
extern(System):

alias F = void function(int);
F f;
```

Output:
```
linkage = 6, vd = variable f @ [current.d(4)]
Illegal instruction
```

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