[Issue 15427] dynamic casting functions should be available in TypeInfo_Class

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15427

--- Comment #1 from Ketmar Dark <ketmar at ketmar.no-ip.org> ---
p.s. `ti.dynamicCast(O)` should still return `void*`. not a big deal, it's very
internal API anyway.

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