[Issue 4372] type of enumerator values reduced to base type in debug info

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=4372

--- Comment #6 from Rainer Schuetze <r.sagitario at gmx.de> ---
Patch by Aldo looks good, should give it a try translating it to the current
backend.

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