[rbi] Simplify some logic that got confused so that passing an actor isolated value to a callee that is isolated ot the same actor is not considered a send. #80911
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…isolated value to a callee that is isolated ot the same actor is not considered a send. The logic here got confused over time. This simplifies the logic and ensures that we do not send a value if it is in the same isolation domain as the callee. The one interesting side effect of this is that in a few tests, due to the logic being confused, we were emitting use-after-send errors for global actor isolated values that were passed to a function that was global actor isolated to the same actor and then used later locally. The error was sending 'X'-isolated a to 'X'-isolated function causes race against nonisolated local uses. In truth, this error is misleading and the only error that we should be emitting in such a case is the error about moving an isolated value into a non-isolated context (which we already emit). rdar://132932382
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The logic here got confused over time. This simplifies the logic and ensures that we do not send a value if it is in the same isolation domain as the callee.
The one interesting side effect of this is that in a few tests, due to the logic being confused, we were emitting use-after-send errors for global actor isolated values that were passed to a function that was global actor isolated to the same actor and then used later locally. The error was sending 'X'-isolated a to 'X'-isolated function causes race against nonisolated local uses. In truth, this error is misleading and the only error that we should be emitting in such a case is the error about moving an isolated value into a non-isolated context (which we already emit).
rdar://132932382