[Issue 19916] union member access should be un- at safe

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19916
Issue 19916 depends on issue 20655, which changed state.

Issue 20655 Summary: [REG: 2.072] attribute inference accepts unsafe union access as @safe
https://issues.dlang.org/show_bug.cgi?id=20655

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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