Support loading function types

compiler/testData/compileKotlinAgainstKotlin/coroutines/builder.kt

@@ -0,0 +1,32 @@
+// FILE: A.kt
+// LANGUAGE_VERSION: 1.2
+import kotlin.coroutines.experimental.*
+
+fun builder(c: suspend () -> String): String {
+    var res = "FAIL"
+    c.startCoroutine(object : Continuation<String> {
+        override val context = EmptyCoroutineContext
+        override fun resume(value: String) {
+            res = value
+        }
+        override fun resumeWithException(exception: Throwable) {
+            throw exception
+        }
+    })
+    return res
+}
+
+// FILE: B.kt
+// LANGUAGE_VERSION: 1.3
+import kotlin.coroutines.experimental.*
+
+fun ok(continuation: Continuation<String>): Any? {
+    return "OK"
+}
+
+fun box(): String {
+    if (builder(::ok) != "OK") return "FAIL 1"
+    if (builder { cont: Continuation<String> -> "OK" } != "OK") return "FAIL 2"
+    if (builder(fun (cont: Continuation<String>): Any? = "OK") != "OK") return "FAIL 2"
+    return "OK"
+}