Fix hprof/ahat for string compression.

Test: m test-art-host
Test: m ahat-test
Test: m test-art-host with string compression enabled
Test: m ahat-test with string compression enabled
Bug: 31040547
Change-Id: I660e39c586d23f4a95686d484ca108466e52d249
diff --git a/tools/ahat/test-dump/Main.java b/tools/ahat/test-dump/Main.java
index e08df67..587d9de 100644
--- a/tools/ahat/test-dump/Main.java
+++ b/tools/ahat/test-dump/Main.java
@@ -45,6 +45,8 @@
   // class and reading the desired field.
   public static class DumpedStuff {
     public String basicString = "hello, world";
+    public String nonAscii = "Sigma (\u01a9) is not ASCII";
+    public String embeddedZero = "embedded\0...";  // Non-ASCII for string compression purposes.
     public char[] charArray = "char thing".toCharArray();
     public String nullString = null;
     public Object anObject = new Object();