crazy linker: convert relocation unpacking to Android style.
Replace relocation unpacking code with functions that understand
the packing format generated by the Android relocation packer.
Switch to using the Android relocation packer when packing during
build.
BUG=
385553
Committed:
https://crrev.com/e5acfbccce659364606758b687b90488e2f44be2
Cr-Commit-Position: refs/heads/master@{#333293}