assertFailsWith: set unexpected exception as a cause of assertion error

#KT-23514

(cherry picked from commit 3c4b86fc79f9dbb6053057fad012544ae330c00f)

runtime/src/main/kotlin/kotlin/test/Assertions.kt

@@ -33,7 +33,7 @@ internal actual fun <T : Throwable> checkResultIsFailure(exceptionClass: KClass<
                     @Suppress("UNCHECKED_CAST")
                     return e as T
                 }
-                asserter.fail(messagePrefix(message) + "Expected an exception of ${exceptionClass.qualifiedName} to be thrown, but was $e")
+                asserter.fail(messagePrefix(message) + "Expected an exception of ${exceptionClass.qualifiedName} to be thrown, but was $e", e)
             }
     )
 }