[DirectX] Implement UseNativeLowPrecision shader flag analysis (#134288) Fixes #112267 Implement the shader flag analysis to set the UseNativeLowPrecision DXIL module flag. The flag is only able to be set when the command-line flag `-enable-16bit-types` is passed to clang-dxc, or equivalently `-fnative-half-type` is passed to clang. When the command-line flag is passed, a module metadata flag called "dx.nativelowprec" is set to 1. The DXILShaderFlags shader flags analysis checks that the module metadata flag "dx.nativelowprec" is set to 1 and the DXIL Version is 1.2 or greater before setting the UseNativeLowPrecision DXIL module flag.
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