Issue 124796
Summary [DirectX] Replace generation of metadata `dx.disable_optimizations` with entry function attribute
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Reporter bharadwajy
    `dx.disable_optimizations` that has been added to HLSL suppport in clang appears to be potentially unnecessary and not defined in [DXIL.rst](https://github.com/Microsoft/DirectXShaderCompiler/blob/main/docs/DXIL.rst). So, replace it by setting the function attribute `Attribute::OptimizeNone` on entry functions of the module to indicate presence of `-Od` flag on the commandline.

Implement this change and add necessary tests.
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