JS backend: simplify and rename tests for closure in nested functions.

js/js.translator/testFiles/closure/cases/closureInNestedFunctions.kt

@@ -0,0 +1,50 @@
+package foo
+
+fun run<T>(f: ()->T) = f()
+
+fun funfun(): Boolean {
+    val result = true
+
+    fun foo(): Boolean {
+        fun bar() = result
+        return bar()
+    }
+
+    return foo()
+}
+
+fun litlit(): Boolean {
+    val result = true
+
+    return run {
+        run { result }
+    }
+}
+
+fun funlit(): Boolean {
+    val result = true
+
+    fun foo(): Boolean {
+        return run { result }
+    }
+
+    return foo()
+}
+
+fun litfun(): Boolean {
+    val result = true
+
+    return run {
+        fun bar() = result
+        bar()
+    }
+}
+
+fun box(): String {
+    if (!funfun()) "funfun failed"
+    if (!litlit()) "litlit failed"
+    if (!funlit()) "funlit failed"
+    if (!litfun()) "litfun failed"
+
+    return "OK"
+}