Add some tests on adapted references with varargs and reflection

Also rename "varargAndDefaults" test directory to "adaptedReferences"

compiler/testData/codegen/box/callableReference/adaptedReferences/inlineDefault.kt

@@ -0,0 +1,11 @@
+// !LANGUAGE: +NewInference +FunctionReferenceWithDefaultValueAsOtherType
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+
+inline fun foo(mkString: () -> String): String =
+        mkString()
+
+fun bar (xs: CharArray = charArrayOf('O','K')) =
+        String(xs)
+
+fun box(): String = foo(::bar)