Add tests for obsolete issues

#KT-31784 Obsolete
 #KT-31757 Obsolete

compiler/testData/codegen/box/fullJdk/kt31757.kt

@@ -0,0 +1,19 @@
+// !LANGUAGE: +NewInference
+// TARGET_BACKEND: JVM
+// FULL_JDK
+
+package test
+
+import java.util.function.*
+
+interface Interface1<T> : () -> T, Supplier<T> {
+    override fun invoke() = get()
+}
+
+class Impl : Interface1<String> {
+    override fun get(): String = "OK"
+}
+
+fun box(): String {
+    return Impl()()
+}