Fix most remaining Polonius test differences#64749

Merged

bors merged 2 commits intorust-lang:masterfrom matthewjasper:liveness-opt

Oct 4, 2019

+142-528

Commits on Oct 2, 2019

Calculate liveness for the same locals with and without -Zpolonius
matthewjasper
committed
Make lifetimes in constants live at the point of use
matthewjasper
committed