Add some tests on adapted references with varargs and reflection

Also rename "varargAndDefaults" test directory to "adaptedReferences"

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

@@ -0,0 +1,34 @@
+// !LANGUAGE: +NewInference +FunctionReferenceWithDefaultValueAsOtherType
+// IGNORE_BACKEND_FIR: JVM_IR
+
+
+class Outer(val o: String) {
+    inner class Inner1(val i: Int, vararg v: String) {
+        val result = "I1" + o + i + if (v.size == 0) "E" else v[0]
+    }
+
+    inner class Inner2(val i: Int, vararg v: String = arrayOf("A")) {
+        val result = "I2" + o + i + v[0]
+    }
+}
+
+fun <T> use0(f: (Int) -> T) = f(11)
+fun <T> use1(f: (Int, String) -> T) = f(12, "B")
+
+fun box(): String {
+    val oouter = Outer("O")
+
+    val r1 = use0(oouter::Inner1).result
+    if (r1 != "I1O11E") return "Fail1: $r1"
+
+    val r2 = use1(oouter::Inner1).result
+    if (r2 != "I1O12B") return "Fail2: $r2"
+
+    val r3 = use0(oouter::Inner2).result
+    if (r3 != "I2O11A") return "Fail3: $r3"
+
+    val r4 = use1(oouter::Inner2).result
+    if (r4 != "I2O12B") return "Fail4: $r4"
+
+    return "OK"
+}