Tuples return lists of variables used and defined; ordering of JMPF operands switched
LiveUse and Def now computed for basic blocks
Block-based liveness analysis working
Per-statement liveout now calculated
Separated liveness out from IRGraph constructed so that it may be re-computed if graph is altered
Returns livein and liveouts as reference parameters
Fixed some namespacing issues
Merge branch 'master' of https://github.com/tcd-swift/tcd-swift into lva
Merge branch 'master' of https://github.com/tcd-swift/tcd-swift