Generate (possibly empty) file classes for files with type aliases.

compiler/backend/src/org/jetbrains/kotlin/codegen/PackageCodegen.java

@@ -99,7 +99,7 @@ public class PackageCodegen {
         List<KtClassOrObject> classOrObjects = new ArrayList<KtClassOrObject>();
 
         for (KtDeclaration declaration : file.getDeclarations()) {
-            if (declaration instanceof KtProperty || declaration instanceof KtNamedFunction) {
+            if (declaration instanceof KtProperty || declaration instanceof KtNamedFunction || declaration instanceof KtTypeAlias) {
                 generatePackagePart = true;
             }
             else if (declaration instanceof KtClassOrObject) {

idea/testData/asJava/fileLightClass/aliasesOnly.kt

@@ -0,0 +1,2 @@
+typealias S = String
+typealias L<T> = List<T>

idea/tests/org/jetbrains/kotlin/asJava/KtFileLightClassTest.kt

@@ -47,6 +47,12 @@ class KtFileLightClassTest : KotlinLightCodeInsightFixtureTestCase() {
         assertEquals(1, aClass.findMethodsByName("bar", false).size)
     }
 
+    fun testAliasesOnly() {
+        val file = myFixture.configureByFile("aliasesOnly.kt") as KtFile
+        val aClass = file.classes.single()
+        assertEquals(0, aClass.getMethods().size)
+    }
+
     override fun getTestDataPath(): String? {
         return PluginTestCaseBase.getTestDataPathBase() + "/asJava/fileLightClass/"
     }