Add test for Obsolete issues

#KT-15956 Obsolete
 #KT-15751 Obsolete
 #KT-16417 Obsolete
 #KT-21787 Obsolete

compiler/testData/codegen/boxInline/reified/kt15956.kt

@@ -0,0 +1,24 @@
+// FILE: 1.kt
+// WITH_REFLECT
+// IGNORE_BACKEND: JVM_IR
+
+package foo
+
+import kotlin.reflect.full.primaryConstructor
+
+inline fun <reified T : Any> f(): String {
+    var result = ""
+    for (p in T::class.primaryConstructor!!.parameters.sortedBy { it.index }) {
+        result += p.name
+    }
+    return result
+}
+
+// FILE: 2.kt
+import foo.*
+
+class A(val O: Int, val K: Int)
+
+fun box(): String {
+    return f<A>()
+}