kotlinx.atomicfu.AtomicInt -> mv:
# {"id":"sourceFile","fileName":"AtomicFU.kt"}
    int value -> a
    java.util.concurrent.atomic.AtomicIntegerFieldUpdater FU -> b
    1:11:void <clinit>():334:334 -> <clinit>
    1:7:int decrementAndGet():312:312 -> a
    1:7:java.lang.String toString():331:331 -> toString
