[llvm] Add --dump-offload-bundle option to llvm-objcopy (PR #143347)

[James Henderson via llvm-commits]

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+## Test that --offloading with a fatbin works correctly
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jh7370 wrote:

```suggestion
## Test that --offloading with a fatbin works correctly.
```
This comment specifies an option that isn't present in llvm-objcopy.

https://github.com/llvm/llvm-project/pull/143347