[Issue 23823] New: Deprecated class alias ignored completely

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23823

          Issue ID: 23823
           Summary: Deprecated class alias ignored completely
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: accepts-invalid
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: elpenguino+D at gmail.com

No deprecation warnings are printed with this code:
```
alias Alias(alias A) = A;
class S {
    deprecated alias value1 = Alias!(5);
}
alias shouldWarn = S.value1;
```
The shouldWarn alias should produce a deprecation warning.

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