[llvm] [TextAPI] Add option to filter out unsupported/unknown/invalid targets (PR #195161)

[Zixu Wang via llvm-commits]

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zixu-w wrote:

Do we need to handle `Architecture` as well? I guess we won't error out during parsing, but could be handing unknown archs down to clients?

https://github.com/llvm/llvm-project/pull/195161