[VectorLayoutAnalysis] Refactor VectorLayoutAnalysis to be an online analysis

[Groverkss]

This converts the VectorLayoutAnalysis into an online analysis, where any information provided as an anchor is immediately analysed pushed throught the IR.

The flow looks like:

start --> (analysis: no information) setAnchor --> (analysis: compute everything it can) setAnchor --> (analysis: compute everything it can with this added information now) rewrite --> (analysis: compute analysis values for the new IR values) end

As a side-effect, I also stopped using mlir's DataFlowAnalysis framework as it's too generic.

[benvanik]

@Groverkss still valid?

[Groverkss]

Not planned anymore