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[mlir] Drop reliance of SliceAnalysis on specific ops.

Authored by nicolasvasilache on Feb 15 2021, 1:44 PM.

Description

[mlir] Drop reliance of SliceAnalysis on specific ops.

SliceAnalysis originally was developed in the context of affine.for within mlfunc.
It predates the notion of region.
This revision updates it to not hardcode specific ops like scf::ForOp.
When rooted at an op, the behavior of the slice computation changes as it recurses into the regions of the op. This does not support gathering all values transitively depending on a loop induction variable anymore.
Additional variants rooted at a Value are added to also support the existing behavior.

Differential revision: https://reviews.llvm.org/D96702