[mlir][NFC] Fix 'gatherLoops' utility
It replaces DenseMap output with a SmallVector and it
removes empty loop levels from the output.
Reviewed By: andydavis1, mehdi_amini
Differential Revision: https://reviews.llvm.org/D74658
[mlir][NFC] Fix 'gatherLoops' utility dcaballe on Feb 19 2020, 10:06 AM. Authored by Tags None Subscribers None
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