Add dequickening support.

Both vdex and BCI require full dequickening support. This
change implements dequickening by using the existing encoded
quickening, and adds the checkcast quickening to that encoding.

bug: 30937355
bug: 32369913
Test: dex_to_dex_decompiler_test.cc test-art-host

Change-Id: Ie95f46946d59b28157d6e47dcf4a859be032d1c3
diff --git a/test/DexToDexDecompiler/Main.java b/test/DexToDexDecompiler/Main.java
new file mode 100644
index 0000000..8f5075a
--- /dev/null
+++ b/test/DexToDexDecompiler/Main.java
@@ -0,0 +1,34 @@
+/*
+ * 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.
+ */
+
+public class Main {
+  Main() {
+    // Will be quickened with RETURN_VOID_NO_BARRIER.
+  }
+
+  public static void main() {
+    Main m = new Main();
+    Object o = m;
+    // The call and field accesses will be quickened.
+    m.foo(m.a);
+
+    // The checkcast will be quickened.
+    m.foo(((Main)o).a);
+  }
+
+  int a;
+  void foo(int a) {}
+}