[Issue 20355] undefined identifier U in core.atomic

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20355

--- Comment #3 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/druntime pull request #2872 "Merge remote-tracking branch
'upstream/stable' into merge_stable" was merged into master:

- 0ff7cc2f4874f6aac3b0becd93390bafc75bc5e9 by MoonlightSentinel:
  Fix Issue 20355 - undefined identifier U in core.atomic

https://github.com/dlang/druntime/pull/2872

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