JS: create new common directory for all generated tests, migrate several tests there

js/js.translator/testData/box/callableReference/function/topLevelFromExtension.kt

@@ -0,0 +1,22 @@
+// This test was adapted from compiler/testData/codegen/box/callableReference/function/.
+package foo
+
+fun <T> run(arg1: T, arg2: T, funRef:(T,T) -> T): T {
+    return funRef(arg1, arg2)
+}
+
+fun tmp(o: Int, k: Int) = o + k
+
+class A
+
+fun A.bar() = (::tmp)(111, 222)
+
+fun box(): String {
+    val result = A().bar()
+    if (result != 333) return "Fail $result"
+
+    var r = run(111, 222, ::tmp)
+    if (result != 333) return "Fail $result"
+
+    return "OK"
+}