Use original field/method signatures in Proguard map

Change-Id: I10013606757b636b370c66fae7667287f43a5c50
diff --git a/src/test/examples/classmerging/ProguardFieldMapTest.java b/src/test/examples/classmerging/ProguardFieldMapTest.java
new file mode 100644
index 0000000..0cbf8a1
--- /dev/null
+++ b/src/test/examples/classmerging/ProguardFieldMapTest.java
@@ -0,0 +1,25 @@
+// Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package classmerging;
+
+public class ProguardFieldMapTest {
+
+  public static void main(String[] args) {
+    B b = new B();
+    b.test();
+  }
+
+  public static class A {
+
+    public String f = "A.f";
+  }
+
+  public static class B extends A {
+
+    public void test() {
+      System.out.println(f);
+    }
+  }
+}