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

[James Henderson via cfe-commits]

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+## Test that llvm-objdump can display nested OffloadBinary images.
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+# The content blobs below were generated from the following YAML Input
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jh7370 wrote:

Nit: `##` for all comments, please.

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