[clang] [llvm] [llvm][tools] Extend llvm-objdump to support nested OffloadBinaries (PR #185425)

[Alex Duran via cfe-commits]

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adurang wrote:

These tests rely on the changes made to llvm-objdump in this PR to work so they couldn't be checked before (even if the functionality already exists). I guess they could be made in a follow-up PR but as they are related to the changes here I'd personally prefer to get them all together.

https://github.com/llvm/llvm-project/pull/185425