Read old suspend functions in 1.3

compiler/testData/compileKotlinAgainstKotlin/coroutines/simple.kt

@@ -0,0 +1,19 @@
+// FILE: A.kt
+// LANGUAGE_VERSION: 1.2
+
+suspend fun dummy() = "OK"
+
+// FILE: B.kt
+// LANGUAGE_VERSION: 1.3
+import kotlin.coroutines.experimental.*
+
+fun box(): String {
+    return dummy(object : Continuation<String> {
+        override val context = EmptyCoroutineContext
+        override fun resume(value: String) {
+        }
+        override fun resumeWithException(exception: Throwable) {
+            throw exception
+        }
+    }) as String
+}