std: pass the Thread for the newly spawned thread to the platform
#146678
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This PR moves the responsibility for calling
set_current(which initialises the thread handle) to the platform implementation. This unblocks #144465 and cleans up the fallout from #144500, as well as enabling the removal of theset_namefunction on platforms without thread names (as we now have access to the thread name in the platform thread main function).This PR also contains a second commit (sorry, I couldn't help myself) that fixes a (mostly theoretical) unsoundness introduced by #115746, which added a call to
current_os_idto the SIGSEGV signal handler even though that function might not be async-signal-safe. The thread ID is now initialised before the stack overflow information, so the ID can be stored therein.