Smarter image layout

Put strings in the dex file that resolves them.

Depth first traversal with overrides for class and dex cache. The
work list keeps track of what oat_index with each pushed item. This
means the static fields of a class will usually be in the same image.

Added layout test to image_test to make sure things are somewhat
reasonably attributed.

Bug: 28640955

Test: test-art-host

(cherry picked from commit 4e9c4e746617bad6a012d799d2f5cf9e01d24ea2)

Change-Id: I67a536c33aeed603b252d8e0f75622c9efbf2559
diff --git a/test/ImageLayoutB/ImageLayoutB.java b/test/ImageLayoutB/ImageLayoutB.java
new file mode 100644
index 0000000..a21c5e2
--- /dev/null
+++ b/test/ImageLayoutB/ImageLayoutB.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.util.HashMap;
+
+class MyClass {
+    public static String string = "ASDF_UNIQUE_STRING";
+    public static HashMap<String, String> map = new HashMap<String, String>();
+    static {
+        map.put("KEY_FOR_HASH_MAP", "VALUE_FOR_HASH_MAP");
+    }
+}