Add a way to specify compact dex level for dexlayout

The option is '-x', which supports "fast" and "none" compact dex
generation. The default is "none".

Test: dexlayout -w out_dir -x fast classes.dex
Bug: 63756964

Change-Id: I77125d5148974d24a0808f80e2400f77f8b57a76
1 file changed