Add UltraLightFacadeClassTest

compiler/testData/asJava/ultraLightFacades/simpleFunctions.kt

@@ -0,0 +1,9 @@
+open fun bar(a: Int, b:Any, c:Foo): Unit {}
+internal fun bar2(a: Sequence, b: Unresolved) {}
+private fun bar3(x: Foo.Inner, vararg y: Inner) = "str"
+fun bar4() = 42
+
+public fun nullableVararg(vararg o: Any?): Unit
+
+operator fun plus(increment: Int): Foo {}
+fun String.onString(a: (Int) -> Any?): Foo {}