Rollup of 8 pull requests#70305

Merged

bors merged 27 commits intorust-lang:masterfrom

Centril:rollup-zi13fz4

Mar 23, 2020

Commits on Mar 11, 2020

librustc_codegen_llvm: Replace deprecated API usage
tmiasko
committed

Commits on Mar 18, 2020

Commits on Mar 19, 2020

Commits on Mar 21, 2020

rustc: keep upvars tupled in {Closure,Generator}Substs.
eddyb
committed
rustc: make {Closure,Generator}Substs::split as cheap as possible.
eddyb
committed
rustc_typeck: move comment about inference variables to where it makes sense.
eddyb
committed

Commits on Mar 23, 2020