[ruby-core:116466] [Ruby master Bug#20220] M:N threading needs to tell ASAN about stack switches

Issue #20220 has been reported by kjtsanaktsidis (KJ Tsanaktsidis).

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Bug #20220: M:N threading needs to tell ASAN about stack switches
https://bugs.ruby-lang.org/issues/20220

* Author: kjtsanaktsidis (KJ Tsanaktsidis)
* Status: Open
* Priority: Normal
* Assignee: kjtsanaktsidis (KJ Tsanaktsidis)
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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When switching stacks via `coroutine_transfer` in the M:N threading information, we need to tell ASAN about it in the same way that we do in cont.c. This is a matter of calling `__sanitizer_start_switch_fiber` in the transferring M:N thread, and then calling `__sanitizer_finish_switch_fiber` in the transferred-to M:N thread.



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