[llvm] [llvm-symbolizer] Make symbolizer parse section relative syntax (PR #168524)

[James Henderson via llvm-commits]

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+## Test section-relative address syntax parsing and error handling for XCOFF.
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jh7370 wrote:

File name should probably be "xcoff-section-relative-syntax.test", right?

https://github.com/llvm/llvm-project/pull/168524