First version was vectors only. With some clever "path" insertion,
we now support any d-dimensional tensor. Up next: reductions too
Reviewed By: bixia, wrengr
Differential Revision: https://reviews.llvm.org/D114024
This revision contains all "sparsification" ops and rewriting necessary to support sparse output tensors when the kernel has no reduction (viz. insertions occur in lexicographic order and are "injective"). This will be later generalized to allow reductions too. Also, this first revision only supports sparse 1-d tensors (viz. vectors) as output in the runtime support library. This will be generalized to n-d tensors shortly. But this way, the revision is kept to a manageable size.
Reviewed By: bixia
Differential Revision: https://reviews.llvm.org/D113705
