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[llvm-readobj] - Refine the error reporting in LLVMStyle<ELFT>::printELFLinkerOptions.
It is possible to:
1) Avoid using the `unwrapOrError` calls and hence allow to continue dumping even when
something is not OK with one of SHT_LLVM_LINKER_OPTIONS sections.
2) replace `reportWarning` with `reportUniqueWarning` calls. In this method it is no-op,
because it is not possible to have a duplicated warnings anyways, but since we probably
want to switch to `reportUniqueWarning` globally, this is a good thing to do.
This patch addresses both these points.
Differential revision: https://reviews.llvm.org/D83131