Build stubs for modifiers

idea/testData/decompiler/stubBuilder/Modifiers/Modifiers.kt

@@ -1,3 +1,18 @@
 package test
 
-data class Modifiers
+data class Modifiers(val x: Int) {
+    external fun extFun()
+
+    var extVar: Int = 1
+        external get
+        external set
+
+    tailrec fun sum(x: Long, sum: Long): Long {
+        if (x == 0.toLong()) return sum
+        return sum(x - 1, sum + x)
+    }
+
+    inline fun inlined(crossinline arg1: ()->Unit, noinline arg2: ()->Unit): Unit {}
+
+    annotation class Ann
+}