Split image_test and oatdump_test.

With sufficient -j, splitting the oatdump_test makes gtests
finish faster, splitting image_test makes valgring tests
finish faster.

make -j 48 valgrind-test-art-host-gtest
  - before: #### make completed successfully (05:20:16 (hh:mm:ss)) ####
  - after: #### make completed successfully (03:05:43 (hh:mm:ss)) ####
Note that the new image_*test variants are still running
long after the rest of the tests is finished. Further
splitting may still be beneficial for host tests. Target
tests with lower -j parameter do not benefit that much.

Test: make -j 48 valgrind-test-art-host-gtest
Bug: 36849303
Change-Id: I2b887e6b3266f9d3efd7b4d71dde0fcf012829d2
diff --git a/compiler/image_write_read_test.cc b/compiler/image_write_read_test.cc
new file mode 100644
index 0000000..32c0b06
--- /dev/null
+++ b/compiler/image_write_read_test.cc
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2011 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.
+ */
+
+#include "image_test.h"
+
+namespace art {
+
+TEST_F(ImageTest, WriteReadUncompressed) {
+  TestWriteRead(ImageHeader::kStorageModeUncompressed);
+}
+
+TEST_F(ImageTest, WriteReadLZ4) {
+  TestWriteRead(ImageHeader::kStorageModeLZ4);
+}
+
+TEST_F(ImageTest, WriteReadLZ4HC) {
+  TestWriteRead(ImageHeader::kStorageModeLZ4HC);
+}
+
+}  // namespace art