[concurrency] Change #isolated to mask out the TBI bits of the witness pointer of the implicit isolated any Actor pointer so we can do optimizations on TBI supporting platforms in the future.#83346

Merged

gottesmm merged 6 commits intoswiftlang:mainfrom

gottesmm:pr-df6aafa41c61b9a9a6ee4965a1564ec2946a0dc9

Oct 18, 2025

Commits on Oct 16, 2025

[concurrency] Add a new type Builtin.ImplicitActor.
gottesmm
committed
[silgen] Change two places we used Builtin.Executor to instead use Optional<any Actor> as an expected executor.
gottesmm
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[sil] Add a new instruction cast_implicit_actor_to_optional_actor.
gottesmm
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[silgen] Use Builtin.ImplicitActor instead of Optional<any Actor> to represent the implicit isolated parameter.
gottesmm
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Test updates for previous commit.
gottesmm
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[concurrency] Implement bit masking for TBI when available or in tagged pointer bits otherwise.
gottesmm
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