KT-1360 Vararg bug in front-end

compiler/testData/codegen/box/vararg/varargsAndFunctionLiterals.kt

@@ -0,0 +1,16 @@
+fun foo(a: Int, vararg b: Int, f: (IntArray) -> String): String {
+  return "test" + a + " " + f(b)
+}
+
+fun box(): String {
+  val test1 = foo(1) {a -> "" + a.size}
+  if (test1 != "test1 0") return test1
+
+  val test2 = foo(2, 2) {a -> "" + a.size}
+  if (test2 != "test2 1") return test2
+
+  val test3 = foo(3, 2, 3) {a -> "" + a.size}
+  if (test3 != "test3 2") return test3
+
+  return "OK"
+}