Finish dexlayout dumping of dex files and added test.

The test runs dexdump and dexlayout over the first core library jar file
and diffs the output, checking that they're the same. More dex files
will be added later for better coverage.

Bug: 29921113
Test: mm test-art-host-gtest-dexlayout_test
(cherry-picked from commit a378e88db648cf19e771714dd1059cf3d41d4753)

Change-Id: Idfd8ac9f069885b675a4a2f0c70aef2cbef5a9b8