Fix a few minor issues in the type checker and SILGen to properly cope with
distributed functions defined within extensions of distributed actors.
While here, centralize the logic that adds the "_remote_" function.
Fixes rdar://84325525.
This is an non-user-visible attribute that is semantically identical to
`nonisolated` except that it allows use in distributed actors. It is
only, and can only, be used for the two fields that distributed actors
have in both the local actor and in the remote proxy, "id" and
"actorTransport". So, special-case the "nonisolated" check for those
fields and stop using `@_distributedActorIndependent`.
Use APIs for creating terminator results that handle forwarding
ownership consistently.
Add ManagedValue::forForwardedRValue(SILValue) to handle cleanups
consistently based on ownership forwarding.
Add SILGenBuilder::createForwardedTermResult(SILType type) for
creating termator results with the correct ownership and cleanups.
Add SILGenBuilder::createTermResult(SILType type, ValueOwnershipKind
ownership) that handles cleanup based on terminator result ownership.
Add SILGenBuilder::createOptionalSomeResult(SwitchEnumInst) so a lot
of code doesn't need to deal with unwrapping Optional types,
terminator results, and ownership rules.
Replace the existing "phi" APIs with a single
SILGenBuilder::createPhi(SILType, ValueOwnershipKind) that handles
cleanup based on phi ownership.
Phis and terminator results are fundamentally different and need to be handled differently everywhere. Remove the confusion where terminator results were generated with a "phi argument" API.
* [Distributed] cleanup some warnings in SILGenDistributed
* [Distributed] cleanup SILGenDestructor, move dist logic to
SILGenDistributed
* [Distributed] de-duplicate SIL gen for if remote/local branch
