[concurrency] Implement protocol witness thunking in SILGen for @execution(caller)/@execution(concurrent). #80622
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This involved cleaning up and generalizing the work from f245389. I followed the same approach: hide the implicit parameter while we run things through translateArgument and friends and then put it back in manually.
As an additional benefit, I think I found a good place to put FunctionIsolation onto lowered AnyFunctionTypes that will not cause cycles in the evaluator since it is done in TypeLowering.
rdar://148785846