Liveness analysis using dataflow (bis)#547
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(I have unfortunately created a huge mess in #513, so here is
a clean version.)
This pull request basically augments the
Cfg_dataflowmodulewith a backward analysis and then instantiates it to compute the
liveness on CFG values. The liveness information computed through
this new analysis is compared to the one from the existing pass.
This pull request is a draft because of the duplication introduced
with respect to the forward variant of the dataflow analysis.
Making the two converge is likely to spot shortcomings or even
mistakes in the forward variant.