Expanded and simplified test for generating bridges in sam conversions.

compiler/testData/codegen/boxAgainstJava/sam/adapters/BridgesForOverridden.java

@@ -0,0 +1,19 @@
+class JavaClass {
+    public interface Super1<T> {
+        Thread call(T t);
+    }
+
+    public interface Super2<T> {
+        T call(String s);
+    }
+
+    public interface Sub extends Super1<String>, Super2<Thread> {
+        Thread call(String s);
+    }
+
+    static void samAdapter(Sub sub) {
+        ((Super1) sub).call("");
+        ((Super2) sub).call("");
+        sub.call("");
+    }
+}