Additional tests on reflection calls

compiler/testData/codegen/boxWithJava/reflection/callPrivateJavaMethod/J.java

@@ -0,0 +1,11 @@
+public class J {
+    private final String result;
+
+    private J(String result) {
+        this.result = result;
+    }
+
+    private String getResult() {
+        return result;
+    }
+}