Imitate support for suspend modifier on parameterless lambdas

#KT-22766 In Progress

compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/suspendModifier.kt

@@ -0,0 +1,31 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+import helpers.*
+import kotlin.coroutines.experimental.*
+import kotlin.coroutines.experimental.intrinsics.*
+
+suspend fun suspendHere(v: String): String = suspendCoroutineOrReturn { x ->
+    x.resume(v)
+    COROUTINE_SUSPENDED
+}
+
+suspend fun foo(): String {
+    var a = "OK"
+    var i = 0
+    val x = suspend {
+        suspendHere(a[i++].toString())
+    }
+
+    return x() + x.invoke()
+}
+
+
+fun box(): String {
+    var result = ""
+
+    suspend {
+        result = foo()
+    }.startCoroutine(EmptyContinuation)
+
+    return result
+}