This is to prepare for implementing the C API for reading a COO tensor to the
given buffers for indices and values.

Reviewed By: wrengr

Differential Revision: https://reviews.llvm.org/D143861

This commit updates how the `SparseTensorConversion` pass handles `NewOp`.  It breaks up the underlying `openSparseTensor` function into two parts (`SparseTensorReader::create` and `SparseTensorReader::readSparseTensor`) so that the pass can inject code for constructing `lvlSizes` between those two parts.  Migrating the construction of `lvlSizes` out of the runtime and into the pass is a necessary first step toward fully supporting non-permutations.  (The alternative would be for the pass to generate a `FuncOp` for performing the construction and then passing that to the runtime; which doesn't seem to have any benefits over the design of this commit.)  And since the pass now generates the code to call these two functions, this change also removes the `Action::kFromFile` value from the enum used by `_mlir_ciface_newSparseTensor`.

Reviewed By: aartbik

Differential Revision: https://reviews.llvm.org/D138363

Systematically updates the SparseTensorRuntime to properly distinguish tensor-dimensions from storage-levels (and their associated ranks, shapes, sizes, indices, etc).  With a few exceptions which are noted in the code, this ensures the runtime has all the **semantic** changes necessary to support non-permutations.

(Whereas **operationally**, since we're still using `std::vector<uing64_t>` to represent the mappings, there's no way to pass in any interesting non-permutations.  Changing the representation to `std::function` will be done in a separate differential.)

Depends On D137680

Reviewed By: aartbik

Differential Revision: https://reviews.llvm.org/D137681

This is to prepare for adding SparseTensorWriter.

Reviewed By: wrengr

Differential Revision: https://reviews.llvm.org/D135477

Restores the fix from D134925 for MSVC without breaking cpu runner.

Differential Revision: https://reviews.llvm.org/D135304

Breaks https://lab.llvm.org/buildbot/#/builders/168/builds/9288

This reverts commit 83839700c32996c58ddebc0c74e3dc4970e005bc.

This restores the fix from D134925 to make MSVC and clang happy.

Reviewed By: stella.stamenova

Differential Revision: https://reviews.llvm.org/D135126

This patch fixes:

  mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp:1348:31: error: comparison
  of integers of different signs: 'size_t' (aka 'unsigned long') and
  'int64_t' (aka 'long') [-Werror,-Wsign-compare]

  mlir/lib/ExecutionEngine/SparseTensor/File.cpp:110:3: error: default
  label in switch which covers all enumeration values
  [-Werror,-Wcovered-switch-default]