Do not use deprecated coroutineContext

Author: ilya-g

core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/InlineRendezvousSwap.kt

@@ -1,6 +1,7 @@
 package kotlinx.coroutines.experimental.io.internal
 
 import kotlinx.coroutines.experimental.*
+import kotlin.coroutines.experimental.coroutineContext
 import kotlin.coroutines.experimental.intrinsics.*
 
 /**