Uday Bondhugula a1dad3a5d9 Extend/improve getSliceBounds() / complete TODO + update unionBoundingBox
- compute slices precisely where the destination iteration depends on multiple source
  iterations (instead of over-approximating to the whole source loop extent)
- update unionBoundingBox to deal with input with non-matching symbols
- reenable disabled backend test case

PiperOrigin-RevId: 234714069
2019-03-29 16:33:11 -07:00
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