Add test for Obsolete issues

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

compiler/testData/codegen/boxInline/callableReference/kt15751_2.kt

@@ -0,0 +1,34 @@
+// FILE: 1.kt
+// IGNORE_BACKEND: JS
+// WITH_RUNTIME
+public inline fun <T> T.myalso(block: (T) -> Unit): T {
+    block(this)
+    return this
+}
+
+public inline fun <T, R : Any> Iterable<T>.mymapNotNull(transform: (T) -> R?): List<R> {
+    return mapNotNullTo(ArrayList<R>(), transform)
+}
+
+// FILE: 2.kt
+// NO_CHECK_LAMBDA_INLINING
+var result = -1;
+
+fun box(): String {
+    fff()
+    return if (result == 1) "OK" else "fail $result"
+}
+
+fun fff(): Int {
+    val y = 0
+    return 0.myalso {
+        fun increase(x: Int): Int = x + y
+
+        val values = listOf(1).mymapNotNull { something(::increase, it) }
+        result = values[0]!!
+    }
+}
+
+fun something(increase: (Int) -> Int, x: Int): Int? {
+    return increase(x)
+}