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b5398180d6
The implementation assumed that compilation units did not overlap, which is not the case. The new implementation uses .debug_ranges to iterate over the requested PCs. This partially resolves #20990. The dump-cov tool is fixed but the same fix needs to be applied to `std.Build.Fuzz.WebServer` (sorting the PC list before passing it to be resolved by debug info). I am observing LLVM emit multiple 8-bit counters for the same PC addresses when enabling `-fsanitize-coverage=inline-8bit-counters`. This seems like a bug in LLVM. I can't fathom why that would be desireable.