Introduce CancellationException

#KT-39126 Fixed

libraries/stdlib/jvm/src/kotlin/coroutines/cancellation/CancellationException.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.coroutines.cancellation
+
+import kotlin.internal.InlineOnly
+
+@ExperimentalStdlibApi
+@SinceKotlin("1.4")
+public actual typealias CancellationException = java.util.concurrent.CancellationException
+
+@InlineOnly
+@ExperimentalStdlibApi
+@SinceKotlin("1.4")
+public actual inline fun CancellationException(message: String?, cause: Throwable?): CancellationException {
+    return CancellationException(message).also { it.initCause(cause) }
+}
+@InlineOnly
+@ExperimentalStdlibApi
+@SinceKotlin("1.4")
+public actual inline fun CancellationException(cause: Throwable?): CancellationException {
+    return CancellationException(cause?.toString()).also { it.initCause(cause) }
+}