Doug Gregor 7789a0ce64 [SE-0371] Back-deploy support for main-actor-isolated deinit ...

When targeting a platform that predates the introduction of isolated
deinit, make a narrow exception that allows main-actor-isolated deinit
to work through a special, inlineable entrypoint that is
back-deployed. This implementation

  1. Calls into the real implementation when available, otherwise
  2. Checks if we're on the main thread, destroying immediately when
we are, otherwise
  3. Creates a new task on the main actor to handle destruction.

This implementation is less efficient than the implementation in the
runtime, but allows us to back-deploy this functionality as far back
as concurrency goes.

Fixes rdar://151029118.

2025-06-30 17:38:08 -07:00

30 KiB

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