[DirectX] Set shader feature flags MinimumPrecision and NativeLowPrecision, and refactor the logic for setting low-precision-related flags (#139623) Fixes #138997 and does refactoring for low-precision-related flags. The shader feature flags MinimumPrecision and NativeLowPrecision were not being set, leading to validation errors. This PR sets these shader feature flags [as in DXC](https://github.com/microsoft/DirectXShaderCompiler/blob/377c4ca6d82adb83bf2eaf978a7040443848d6fd/lib/DXIL/DxilShaderFlags.cpp#L58-L63) and adds tests for them. This PR also performs some refactoring of low-precision-related flags to make it less confusing. - The `UseNativeLowPrecision` DXIL module flag has been renamed to `NativeLowPrecisionMode` to imply that it is setting some execution state which the module should be interpreted with - The LLVM module flag `dx.nativelowprec` is now read only once and sets a bool to be used by `updateFunctionFlags()` and for setting the DXIL module flag `NativeLowPrecisionMode` - The `MinimumPrecision`, `NativeLowPrecision`, and `LowPrecisionPresent` shader feature flags are all set together under `updateFunctionFlags()` - Moved the logic for setting DXIL module flags `NativeLowPrecisionMode` and `ResMayNotAlias` out of the per-function loop and placed it alongside the logic for setting other DXIL module flags (`DisableOptimizations`, `Max64UAVs`, and `UAVsAtEveryStage` flags) --------- Co-authored-by: Justin Bogner <mail@justinbogner.com>
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