[dx12] Drop code for llvm passes which prepare for DXIL generation. #5998
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2 passes are added for DXIL generation. TaichiIntrinsicLower will translate taichi intrinsic like thread_idx into the form DirectX backend expected. TaichiRuntimeContextLower will translate the TaichiRuntimeContext parameter for kernel into Buffers/ConstantBuffers. TaichiRuntimeContextLower is empty now. It is added after inline so optimizations reduce the load/store on temp ptr. And it is easier to know a store is on the TaichiRuntimeContext.
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2 passes are added for DXIL generation.
TaichiIntrinsicLower will translate taichi intrinsic like thread_idx into the form DirectX backend expected.
TaichiRuntimeContextLower will translate the TaichiRuntimeContext parameter for kernel into Buffers/ConstantBuffers.
TaichiRuntimeContextLower is empty now.
It is added after inline so optimizations reduce the load/store on temp ptr. And it is easier to know a store is on the TaichiRuntimeContext.
Related issue = #5276