Fix spin-loop representation

[eupp]

Due to some bug, spin loops can be represented incorrectly: spin-loop arrow and spin-loop nestedness is broken.

Example:

|             BlockingEventLoop#1.processNextEvent(): 9223372036854775807 at BlockingCoroutine.joinBlocking(Builders.kt:85)    |                                                                                                                                                                          |                                                                                                                                                                                            |
|             | isCompleted(): false at BlockingCoroutine.joinBlocking(Builders.kt:87)                                         |                                                                                                                                                                          |                                                                                                                                                                                            |
|             | AbstractTimeSourceKt.getTimeSource(): null at BlockingCoroutine.joinBlocking(Builders.kt:88)                   |
|             | LockSupport.parkNanos(<cont>, 9223372036854775807) at BlockingCoroutine.joinBlocking(Builders.kt:88)           |
|             | BlockingEventLoop#1.processNextEvent(): 9223372036854775807 at BlockingCoroutine.joinBlocking(Builders.kt:85)  |
|             | processUnconfinedEvent(): false at EventLoopImplBase.processNextEvent(EventLoop.common.kt:260)                 |
|             | _delayed.get(): null at EventLoopImplBase.processNextEvent(EventLoop.common.kt:262)                            |
|             | dequeue(): null at EventLoopImplBase.processNextEvent(EventLoop.common.kt:278)                                 |
|             | getNextTime(): 9223372036854775807 at EventLoopImplBase.processNextEvent(EventLoop.common.kt:283)              |
|             |   getNextTime(): 9223372036854775807 at EventLoopImplBase.getNextTime(EventLoop.common.kt:205)                 |
|             └╶╶ switch (reason: active lock detected)                                                                        |

https://github.com/JetBrains/lincheck/blob/39a959952b0df23fb52b16a093b147198d854c17/src/jvm/test/resources/expected_logs/run_concurrent_test/coroutines/coroutines_jdk17.txt#L70