Fix translation to JS of call to top-level fun with vararg and @JsModule

See KT-17871

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -5278,6 +5278,12 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/jsModule/importCountUmd.kt");
             doTest(fileName);
         }
+
+        @TestMetadata("topLevelVarargFun.kt")
+        public void testTopLevelVarargFun() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/jsModule/topLevelVarargFun.kt");
+            doTest(fileName);
+        }
     }
 
     @TestMetadata("js/js.translator/testData/box/jsName")

js/js.translator/src/org/jetbrains/kotlin/js/translate/callTranslator/FunctionCallCases.kt

@@ -73,12 +73,12 @@ object DefaultFunctionCallCase : FunctionCallCase() {
                                         callableDescriptor: CallableDescriptor,
                                         isNative: Boolean,
                                         hasSpreadOperator: Boolean): JsExpression {
+        val functionRef = ReferenceTranslator.translateAsValueReference(callableDescriptor, context)
         if (isNative && hasSpreadOperator) {
-            val functionCallRef = Namer.getFunctionApplyRef(JsNameRef(context.getNameForDescriptor(callableDescriptor)))
+            val functionCallRef = Namer.getFunctionApplyRef(functionRef)
             return JsInvocation(functionCallRef, argumentsInfo.translateArguments)
         }
 
-        val functionRef = ReferenceTranslator.translateAsValueReference(callableDescriptor, context)
         return JsInvocation(functionRef, argumentsInfo.translateArguments)
     }
 

js/js.translator/testData/box/jsModule/topLevelVarargFun.js

@@ -0,0 +1,5 @@
+define("bar", [], function() {
+    return function() {
+        return "(" + Array.prototype.join.call(arguments, "") + ")";
+    };
+});

js/js.translator/testData/box/jsModule/topLevelVarargFun.kt

@@ -0,0 +1,15 @@
+// EXPECTED_REACHABLE_NODES: 490
+// MODULE_KIND: AMD
+@JsModule("bar")
+external fun foo(vararg arg: String): String
+
+fun box(): String {
+    val x = arrayOf("a", "b")
+    var r = foo(*x)
+    if (r != "(ab)") return "fail1: $r"
+
+    r = foo("c", "d")
+    if (r != "(cd)") return "fail2: $r"
+
+    return "OK"
+}