[clang] [llvm] Add length HLSL function to DirectX Backend (PR #101256)

[Damyan Pepper via llvm-commits]

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@@ -908,6 +908,38 @@ float3 lerp(float3, float3, float3);
 _HLSL_BUILTIN_ALIAS(__builtin_hlsl_lerp)
 float4 lerp(float4, float4, float4);
 
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damyanp wrote:

PR title looks like it may be misnamed, since this is also adding the HLSL builtin functions, it is doing more than just adding it to the backend.

https://github.com/llvm/llvm-project/pull/101256