Do not generate ACONST_NULL as continuation of crossinline suspend lambda

compiler/testData/codegen/boxInline/suspend/returnValue.kt

@@ -0,0 +1,46 @@
+// FILE: inlined.kt
+// WITH_RUNTIME
+// NO_CHECK_LAMBDA_INLINING
+import kotlin.coroutines.experimental.*
+import kotlin.coroutines.experimental.intrinsics.*
+
+inline suspend fun suspendThere(v: String): String = suspendCoroutineOrReturn { x ->
+    x.resume(v)
+    COROUTINE_SUSPENDED
+}
+
+suspend inline fun complexSuspend(crossinline c: suspend () -> String): String {
+    return run {
+        c()
+    }
+}
+
+// FILE: inleneSite.kt
+import kotlin.coroutines.experimental.*
+import kotlin.coroutines.experimental.intrinsics.*
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(object: Continuation<Unit> {
+        override val context: CoroutineContext
+            get() = EmptyCoroutineContext
+
+        override fun resume(value: Unit) {
+        }
+
+        override fun resumeWithException(exception: Throwable) {
+            throw exception
+        }
+    })
+}
+
+suspend fun suspendHere(): String = suspendThere("O")
+
+fun box(): String {
+    var result = ""
+
+    builder {
+        result = suspendHere() + complexSuspend { suspendThere("K") }
+    }
+
+    return result
+}