Finish blessing coverage/mcdc
tests after LLVM 19 upgrade
#128477
Merged
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Context: #127513 (comment)
These changes aren't needed for Rust CI, because after the LLVM 19 upgrade we have no jobs that run these tests in
coverage-run
mode against LLVM 18. But they might help external builds.The longer-term plan is to completely drop (unstable) MC/DC support on LLVM 18, as part of getting it working on LLVM 19 in #126733.
cc @cuviper