[llvm] Add --offoading option to llvm-readobj (PR #143342)

[David Salinas via llvm-commits]

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+## Test that --offloading with a fatbin works correctly.
+# REQUIRES: target={{x86_64-.*-linux.*}}
+# REQUIRES: amdgpu-registered-target
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david-salinas wrote:

ok.  Though I think I need the amdgpu-registered-target to get a hip fatbin offload section.

https://github.com/llvm/llvm-project/pull/143342