Don't embed the dex code in the oat file if dex is uncompressed.

Take uncompressed dex code as a signal that the app wants to
opt into b/63920015.

bug: 63920015
Test: dex2oat_test, 071-dexfile-clean-map

Change-Id: I878e7bb80fc895a2d9aafe81aa7666b86af1f808