[Issue 21119] Code coverage checker is not instrumenting backend source files

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21119

--- Comment #2 from Dlang Bot <dlang-bot at dlang.rocks> ---
@MoonlightSentinel created dlang/dmd pull request #11522 "Workaround for Issue
21119 - Disable -betterC for coverage builds" mentioning this issue:

- Workaround for Issue 21119 - Disable -betterC for coverage builds

  because -betterC apparently breaks coverage generation

https://github.com/dlang/dmd/pull/11522

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