Move to async implementations of `UserToolchain.init` and `SwiftSDK.hostSwiftSDK`#9251

Draft

plemarquand wants to merge 5 commits intoswiftlang:mainfrom

plemarquand:async-usertoolchain-swiftsdk

Commits on Nov 26, 2025

Add async versions of `UserToolchain.init` and `SwiftSDK.hostSwiftSDK`
plemarquand
committed
Add back async versions until the ecosystem can adopt the async versions
plemarquand
committed
Use renamed async versions of the new methods
plemarquand
committed

Commits on Nov 27, 2025

Fixup some warnings
plemarquand
committed

Commits on Dec 1, 2025

Mark ComputeChecksum as an async command
plemarquand
committed