test: adapt genericParameterResult.kt test for JS IR backend.

compiler/testData/codegen/box/coroutines/inlineClasses/genericParameterResult.kt

@@ -1,8 +1,10 @@
 // WITH_RUNTIME
-// IGNORE_BACKEND: JS_IR
 
 import kotlin.coroutines.*
 
+var stdout = ""
+fun println(s: Any?) { s?.let { stdout += it } }
+
 fun box(): String {
     suspend {
         listOf(Result.success(true)).forEach {
@@ -11,5 +13,8 @@ fun box(): String {
     }.startCoroutine(Continuation(EmptyCoroutineContext) {
         it.getOrThrow()
     })
+
+    if (stdout != "true") return "FAIL: forEach lambda inside a coroutine wasn't called"
+
     return "OK"
 }