Sarah Spall 4d2d0afcee
[HLSL] Implement HLSL Aggregate splatting (#118992)
Implement HLSL Aggregate Splat casting that handles splatting for arrays
and structs, and vectors if splatting from a vec1.
Closes #100609 and Closes #100619 
Depends on #118842
2025-02-14 09:25:24 -08:00
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