Add test for Obsolete issues

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

compiler/testData/codegen/boxInline/anonymousObject/kt15751.kt

@@ -0,0 +1,32 @@
+// FILE: 1.kt
+// NO_CHECK_LAMBDA_INLINING
+class A {
+    val foo = fun(call: () -> Unit) =
+        ext {
+            fun send() {
+                call()
+            }
+
+            bar {
+                send()
+            }
+        }
+
+    fun bar(body: () -> Unit) {
+        body()
+    }
+
+    inline fun A.ext(init: X.() -> Unit) {
+        return X().init()
+    }
+
+    class X
+}
+
+// FILE: 2.kt
+
+fun box(): String {
+    var result = "fail"
+    A().foo { result = "OK" }
+    return result
+}