[llvm] [XCOFF][obj2yaml] Support SymbolAlignmentAndType as 2 separate fields in YAML. (PR #76828)

[James Henderson via llvm-commits]

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+## Check that obj2yaml can parse SymbolAlignmentAndType, SymbolAlignment,
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jh7370 wrote:

It sounds to me like this test is about yaml2obj more than obj2yaml. Please update the comment and move into the yaml2obj test directory.

https://github.com/llvm/llvm-project/pull/76828