0455596e1e
This patch adds the DAG isel changes for kernel argument preloading. These changes are not usable with older firmware but subsequent patches in the series will make the codegen backwards compatible. This patch should only be submitted alongside that subsequent patch. Preloading here begins from the start of the kernel arguments until the amount of arguments indicated by the CL flag amdgpu-kernarg-preload-count. Aggregates and arguments passed by-ref are not supported. Special care for the alignment of the kernarg segment is needed as well as consideration of the alignment of addressable SGPR tuples when we cannot directly use misaligned large tuples that the arguments are loaded to. Reviewed By: bcahoon Differential Revision: https://reviews.llvm.org/D158579
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