S. Bharadwaj Yadavalli f2650c54c9 [DirectX] Set Shader Flag DisableOptimizations (#126813) ...

- Set the shader flag `DisableOptimizations` based on `optnone`
attribute of shader entry functions.

- Add DXIL Metadata Analysis pass as pre-requisite for Shader Flags pass
to obtain entry function information collected therein.

- Named module metadata `dx.disable_optimizations` is intended to
indicate disabling optimizations (`-O0`) via commandline flag. However,
its intent is fulfilled by `optnone` attribute of shader entry functions as 
implemented in a recent change, and thus not needed. Delete
generation of named metadata and corresponding test file
`disable_opt.ll`.

- Add tests to verify correctness of setting shader flag.

Closes #112263

2025-02-12 16:45:01 -05:00

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