Imitate support for suspend modifier on parameterless lambdas

#KT-22766 In Progress

libraries/stdlib/src/kotlin/util/Suspend.kt

@@ -0,0 +1,9 @@
+/*
+ * Copyright 2000-2018 JetBrains s.r.o. 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
+
+@kotlin.internal.InlineOnly
+public inline fun <R> suspend(noinline block: suspend () -> R): suspend () -> R = block