[llvm-readelf/llvm-objdump] - Improve/refactor the implementation of SHT_LLVM_ADDRSIG section dumping.
- Adds a llvm-readobj/llvm-readelf test file for SHT_LLVM_ADDRSIG sections. (we do not have any)
- Enables dumping of SHT_LLVM_ADDRSIG with --all.
- Changes the logic to report a warning instead of an error when something goes wrong during dumping (allows to continue dumping SHT_LLVM_ADDRSIG and other sections on error).
- Refactors a piece of logic to a new toULEB128Array helper which might be used for GNU-style dumping implementation.
Differential revision: https://reviews.llvm.org/D68383