[clang] [llvm] [HLSL][DXIL] Implement `refract` intrinsic (PR #147342)

[Damyan Pepper via llvm-commits]

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+; Function Attrs: alwaysinline mustprogress nofree norecurse nosync nounwind willreturn memory(none)
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damyanp wrote:

Can you help me understand what this file is for please?  It doesn't look like it is actually testing anything.

https://github.com/llvm/llvm-project/pull/147342