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

[James Henderson via llvm-commits]

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+## Test archive member recognition by name (GNU archive format).
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jh7370 wrote:

Let's rename the tests to `archive-member-gnu` and `archive-member-big-archive`, since they're testing the same functionality.

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