Package manager changes for dual zygote stack.

- Pass down the app's instruction set to dexopt so that
  it can compile the dex file for the right architecture.

- Also pass down the app's instruction set to rmdex, movedex
  and getSize so that they can construct the cache file
  location properly.

- Temporarily compile "system" jars such as am,wm etc. for
  both architectures. A follow up change will ensure that
  they're compiled only for one architecture (the same
  arch. as the system server).

- Java "shared" libraries are now compiled for the right
  architecture when an app requires them.

- Improve the app native library ABI detection to account
  for system apps installed in /system/lib{64}/<packagename>
  and also handle sdcard and forward locked apps correctly.

Change-Id: I4f380b146137803e51d56fdf355c3bdfc92c409d