zygote to preload public native libraries

Preload public native libraries when starting a zygote
This lets other users of libnativeloader (like dex2oat)
avoid unnecessary cold loads of libandroid.so which could
take up to a second.

Bug: http://b/27245894
Change-Id: I1499a7485c186b185fce8a1f8d05afcd579d59cc
2 files changed