wren romano 4792b8ae86 [mlir][sparse] Cleaning up SparseTensorFile::readMMEHeader
This is a followup to the refactoring of D133462, D133830, D133831, and D133833.

Depends On D133833

Reviewed By: aartbik

Differential Revision: https://reviews.llvm.org/D133837
2022-09-29 15:00:50 -07:00
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