Doug Gregor 296e14662a Rework runtime entrypoints for isolated conformance checking ...

Replace the pair of global actor type/conformance we are passing around with
a general "conformance execution context" that could grow new functionality
over time. Add three external symbols to the runtime:

* swift_conformsToProtocolWithExecutionContext: a conforms-to-protocol check
  that also captures the execution context that should be checked before
  using the conformance for anything. The only execution context right now
  is for an isolated conformance.
* swift_isInConformanceExecutionContext: checks whether the function is
  being executed in the given execution context, i.e., running on the
  executor for the given global actor.
* swift_ConformanceExecutionContextSize: the size of the conformance
  execution context. Client code outside of the Swift runtime can allocate
  a pointer-aligned region of memory of this size to use with the runtime
  functions above.

2025-03-07 23:52:20 -08:00

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