Added WaveOps tests for QuadReadLaneAt#1335
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Resolves #884.
Note there is a separate testing path between DXIL and SPIRV due to the lane index restriction between the two IRs. DXIL allows lane index to be non-uniform as described in https://github.com/microsoft/DirectXShaderCompiler/wiki/Wave-Intrinsics, whereas SPIRV only allows constant (dynamically uniform after version 1.5, https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpGroupNonUniformQuadBroadcast).