fix wrong buffer for oneShotAllReduceKernel under PUSH_MODE
#2099
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`buffers[params.local_rank]` is not the buffer local to a gpu because `buffers` was shifted previously
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buffers[params.local_rank]is not the buffer local to a GPU becausebufferswas shifted previously. Use eitherbuffers[0]orlocal_shared_bufferinstead. Reduction with data read from the buffer of another GPU leads to performance penalty.