[Issue 12891] add atomicFetchAdd and atomicFetchSub to core.atomic

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12891

Martin Nowak <code at dawg.eu> changed:

           What    |Removed                     |Added
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            Summary|add atomicInc and atomicDec |add atomicFetchAdd and
                   |to core.atomic              |atomicFetchSub to
                   |                            |core.atomic

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