Draft: vkd3d-shader/dxil: Implement IsHelperLane for SM < 6.6.
Shader models before 6.6 allow the use of this intrinsic, which falls back to SV_Coverage == 0.
EDIT: Marking this as draft because it conflicts with !1133.
Edited by Conor McCarthy
Shader models before 6.6 allow the use of this intrinsic, which falls back to SV_Coverage == 0.
EDIT: Marking this as draft because it conflicts with !1133.