Configure hosts separately from targets when --target is specified.#9322

Merged

bors merged 12 commits intorust-lang:masterfrom jameshilliard:split-host

Jun 1, 2021

+514-9

Commits on Apr 27, 2021

Add feature gate for target-applies-to-host.
jameshilliard
committed

Commits on Apr 30, 2021

Code cleanups for the split-host work
joshtriplett
committed

Commits on May 3, 2021

Add dedicated tracking issues for host-config/target-applies-to-host features.
jameshilliard
committed

Commits on May 7, 2021

Simplify target_config insert.
jameshilliard
committed