Without enforcing limits on `ShenandoahControlIntervalMin` and `ShenandoahControlIntervalMax`, the user may supply values that cause assertions to fail. This assertion failure has been observed in Genshen's regulator thread:
```
#0 0x000028e8062d021a in ShenandoahRegulatorThread::regulator_sleep (this=0x4ef9701893b0) at src/hotspot/share/gc/shenandoah/shenandoahRegulatorThread.cpp:125
#1 0x000028e8062d0027 in ShenandoahRegulatorThread::regulate_young_and_old_cycles (this=0x4ef9701893b0) at src/hotspot/share/gc/shenandoah/shenandoahRegulatorThread.cpp:95
#2 0x000028e8062cfd06 in ShenandoahRegulatorThread::run_service (this=0x4ef9701893b0) at src/hotspot/share/gc/shenandoah/shenandoahRegulatorThread.cpp:51
```
But it could just as easily happen in other modes to the `ShenandoahControlThread` instance.