Treat any coroutine as it has non-const closure

Because it's always does capture controller

compiler/testData/codegen/box/coroutines/emptyClosure.kt

@@ -0,0 +1,26 @@
+var result = 0
+
+class Controller {
+    suspend fun suspendHere(x: Continuation<String>) {
+        result++
+        x.resume("OK")
+    }
+}
+
+
+fun builder(coroutine c: Controller.() -> Continuation<Unit>) {
+    c(Controller()).resume(Unit)
+}
+
+fun box(): String {
+
+    for (i in 1..3) {
+        builder {
+            if (suspendHere() != "OK") throw java.lang.RuntimeException("fail 1")
+        }
+    }
+
+    if (result != 3) return "fail 2: $result"
+
+    return "OK"
+}