[llvm] [llvm-symbolizer] Recognize AIX big archive (PR #150401)

[via llvm-commits]

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+// Test big archive recognition and error handling in llvm-symbolizer.
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midhuncodes7 wrote:

Agreed, I have changed the tests as below:
1. Big archive symbolization - big-archive.test
2. Archive symbolization - archive-member.test

Both tests use XCOFF format. 

https://github.com/llvm/llvm-project/pull/150401