subtyping constraint: accept array types if left type is assignable from array, e.g Serializable (IDEA-146592)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/graphInference/ArrayTypeAssignability.java

@@ -0,0 +1,10 @@
+import java.io.Serializable;
+import java.util.List;
+
+class Test {
+  public void serialize(Serializable o) {}
+
+  public void foo(List<String> strings) {
+    serialize(strings.toArray(new String[0]));
+  }
+}