[llvm] [llvm-objdump] Error with relevant message when adding invalid notes (PR #90458)

[James Henderson via llvm-commits]

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+# Verify that --add-section can be used to add a note section which is
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jh7370 wrote:

Nit: use `##` for comments in new test files.

This comment doesn't make sense though: this test is about adding invalid note sections...

https://github.com/llvm/llvm-project/pull/90458