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

[Sarah Spall via llvm-commits]

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@@ -287,6 +287,27 @@ bool SemaSPIRV::CheckSPIRVBuiltinFunctionCall(const TargetInfo &TI,
     if (CheckAllArgTypesAreCorrect(&SemaRef, TheCall,
                                    llvm::ArrayRef(ChecksArr)))
       return true;
+    // Check that first two arguments are vectors of the same type
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spall wrote:

the first two can be scalars as well; they just need to be the same type. So I'd recommend updating this comment to state as such. 

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