Add tests for obsolete issues

#KT-38804 Obsolete
 #KT-38801 Obsolete
 #KT-38835 Obsolete
 #KT-38737 Obsolete
 #KT-38664 Obsolete
 #KT-38549 Obsolete
 #KT-38766 Obsolete
 #KT-38714 Obsolete

compiler/testData/codegen/box/inference/kt38664.kt

@@ -0,0 +1,40 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// IGNORE_BACKEND: JS
+
+interface C<A : Any, B : Any> {
+    fun foo(a: A): B
+
+    companion object {
+        inline fun <reified A : Any, reified B : Any> inlinefun(crossinline fooParam: (A) -> B): C<A, B> {
+            return object : C<A, B> {
+                override fun foo(a: A) = fooParam(a)
+            }
+        }
+    }
+}
+
+
+data class A(val s: String) {
+    companion object : C<A, String> by C.inlinefun(
+        fooParam = { it.s }
+    )
+}
+
+class OtherB {
+    var a: String? = null
+}
+
+data class B(val a: A?) {
+    companion object : C<B, OtherB> by C.inlinefun(
+        fooParam = {
+            OtherB().apply {
+                a = it.a?.let(A::foo)
+            }
+        }
+    )
+}
+
+fun box(): String {
+    val b = B(A("OK"))
+    return B.foo(b).a ?: "fail"
+}