Decode only the needed tables from CodeInfo.

Most use cases need only the first two bit tables from CodeInfo.
Add flag to the decode method so that only those two are loaded.
We only touched the table header but that still made difference.

This speeds up pmd by over 10%.

Test: test-art-host-gtest
Change-Id: I7740081bf18205dd69864503b5bcec7de5e1a901
11 files changed