Add tests for Obsolete issues

#KT-18977 Obsolete

compiler/testData/codegen/boxInline/reified/kt18977.kt

@@ -0,0 +1,26 @@
+// FILE: 1.kt
+package test
+
+class AbstractTreeNode<T>(val value: T, val parent: AbstractTreeNode<T>?)
+
+internal inline fun <reified T : Any> AbstractTreeNode<*>.findNotNullValueOfType(strict: Boolean = false): T {
+    return findValueOfType(strict)!!
+}
+
+internal inline fun <reified T : Any> AbstractTreeNode<*>.findValueOfType(strict: Boolean = true): T? {
+    var current: AbstractTreeNode<*>? = if (strict) this.parent else this
+    while (current != null) {
+        val value = current.value
+        if (value is T) return value
+        current = current.parent
+    }
+    return null
+}
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    return AbstractTreeNode("OK", null).findNotNullValueOfType<String>()!!
+}