Revert "Revert "Switch to using ELF-64 for 64-bit architectures.""

This reverts commit 650f0c49ac4aff3c9f871cd041042ae28b7e1e0a.

Bug: 21403573
Change-Id: I9e46b08ffa75dd7ed8641c8ba610d23d08ddd3ef
1 file changed