Support compiling run-tests with jack

This CL adds support to compile run-test source files with jack. When
a test needs to rely on class files, we use jill to convert them to a
jack library.

We need to pass the full classpath to jack containing at least core
classes (like java.lang.Object). This means the Android tree must
have been compiled with jack first so we find all the necessary
classes.jack files.

Some tests still rely on dex files generated with the old toolchain.
We keep building them this way for the moment and will update them
later, when they get ready for Jack.

Also updates a few tests dealing with garbage collection to avoid a
situation where a reference can be retained by a local DEX register.

Bug: 19467889
Change-Id: I9eedd0705d1186d28a2acd37ea42a1762cd0ace2
diff --git a/test/454-get-vreg/build b/test/454-get-vreg/build
new file mode 100644
index 0000000..08987b5
--- /dev/null
+++ b/test/454-get-vreg/build
@@ -0,0 +1,26 @@
+#!/bin/bash
+#
+# Copyright (C) 2015 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.
+
+# Stop if something fails.
+set -e
+
+# The test relies on DEX file produced by javac+dx so keep building with them for now
+# (see b/19467889)
+mkdir classes
+${JAVAC} -d classes `find src -name '*.java'`
+${DX} -JXmx256m --debug --dex --dump-to=classes.lst --output=classes.dex \
+  --dump-width=1000 ${DX_FLAGS} classes
+zip $TEST_NAME.jar classes.dex