Test for obsolete KT-8133

#KT-8133 Obsolete

compiler/testData/codegen/boxInline/anonymousObject/kt8133.1.kt

@@ -0,0 +1,14 @@
+import test.*
+
+interface foo {
+    fun bar(): String
+}
+
+fun box(): String {
+    val baz = "OK".myLet {
+        object : foo {
+            override fun bar() = it
+        }
+    }
+    return baz.bar()
+}

compiler/testData/codegen/boxInline/anonymousObject/kt8133.2.kt

@@ -0,0 +1,3 @@
+package test
+
+public inline fun <T, R> T.myLet(f: (T) -> R): R = f(this)