runtime: add a test for asynchronous safe points
This adds a test of preempting a loop containing no synchronous safe points for STW and stack scanning. We couldn't add this test earlier because it requires scheduler, STW, and stack scanning preemption to all be working. For #10958, #24543. Change-Id: I73292db78ca3d14aab11bdafd26d03986920ef0a Reviewed-on: https://go-review.googlesource.com/c/go/+/201777 Run-TryBot: Austin Clements <austin@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com>
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