[llvm] [DXIL][Analysis] Collect Function properties in Metadata Analysis (PR #105728)

[S. Bharadwaj Yadavalli via llvm-commits]

bharadwajy wrote:

> Sorry I didn't notice it when the pass itself went in, but we should really have some testing in `llvm/test/Analysis/DXILMetadataAnalysis`, not just piggy backing on the DirectX backend tests.

Moved testing of DXIL Metadata Analysis out of DirectX backend tests to `llvm/test/Analysis/DXILMetadataAnalysis` and added an additional test.

https://github.com/llvm/llvm-project/pull/105728