elf: report errors for some detected malformed object contents #18207
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Fixes #18205
Although it fixes the above issue, it's just the beginning of proper error handling in the linker. I will be adding better error catching and reporting incrementally as it's quite an involved task.
This PR also addresses a latent bug in writing a static library when one source is incrementally compiled Zig source - an example of this could be generating
libcompiler_rt.a
without LLVM. The bug would incorrectly calculate the total size of the incrementally compiled Zig source and thus it would fail to correctly re-encode it in the output archive file.