make the fuzzer vaguely work on macOS#25981
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Like ELF, we now have `std.debug.MachOFile` for the host-independent parts, and `std.debug.SelfInfo.MachO` for logic requiring the file to correspond to the running program.
This is relevant to PIEs, which are notably enabled by default on macOS. The build system needs to only see virtual addresses, that is, those which do not have the slide applied; but the fuzzer itself naturally sees relocated addresses (i.e. with the slide applied). We just need to subtract the slide when we communicate addresses to the build system.
The full file may not be written, either due to a previous chunk being in-progress when `sendFile` was called, or due to `limit`.
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Thanks @squeek502; I plan to merge these fixes as-is for now, but test coverage should probably be separately merged before the issues are closed. I am quite confident that my fixes here are correct. |
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(and also fix some general fuzzer regressions)