[Issue 11609] Use better substituted characters in coverage output filenames

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=11609

--- Comment #1 from dlangBugzillaToGithub <robert.schadek at posteo.de> ---
THIS ISSUE HAS BEEN MOVED TO GITHUB

https://github.com/dlang/dmd/issues/18721

DO NOT COMMENT HERE ANYMORE, NOBODY WILL SEE IT, THIS ISSUE HAS BEEN MOVED TO
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