Add some tests on adapted references with varargs and reflection

Also rename "varargAndDefaults" test directory to "adaptedReferences"

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

@@ -0,0 +1,31 @@
+// !LANGUAGE: +NewInference +FunctionReferenceWithDefaultValueAsOtherType
+// IGNORE_BACKEND_FIR: JVM_IR
+
+fun call0(f: (String) -> String, x: String): String = f(x)
+fun call1(f: (String, String) -> String, x: String, y: String): String = f(x, y)
+fun call2(f: (String, String, String) -> String, x: String, y: String, z: String): String = f(x, y, z)
+
+fun box(): String {
+
+    var s = "1"
+
+    fun foo(x: String, y: String = "5", z: String = "4"): String = s + x + y + z
+
+    val r = call1(::foo, "2", "3")
+    if (r != "1234") return "FAIL $r"
+
+    fun bar(x: String, vararg y: CharSequence = arrayOf("2")): String = s + x + y.size + y[0]
+
+    s = "5"
+    val r0 = call0(::bar, "3")
+    if (r0 != "5312") return "FAIL1 $r0"
+
+    s = "6"
+    val r2 = call1(::bar, "2", "5")
+    if (r2 != "6215") return "FAIL2 $r2"
+
+    s = "7"
+    val r3 = call2(::bar, "8", "9", "10")
+    if (r3 != "7829") return "FAIL3 $r3"
+    return "OK"
+}