Add missing barriers in litmus test runner (#25)

* add missing barrier in litmus test runner

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Signed-off-by: Evgeniy Moiseenko <evg.moiseenko94@gmail.com>

Author: eupp

core/src/commonMain/kotlin/org/jetbrains/litmuskt/ThreadlikeRunner.kt

@@ -13,6 +13,7 @@ abstract class ThreadlikeRunner : LitmusRunner() {
         // performance optimizations:
         // 1) each thread takes a portion of states and calculates stats for it
         // 2) each thread then resets these states
+        barrier.await()
         rangeResult = calcStats(states.view(resultCalcRange), test.outcomeSpec, test.outcomeFinalizer)
         val resetFunction = test.resetFunction
         for (i in resultCalcRange) states[i].resetFunction()