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Reuses the ModuleCache POSIX module implementation for Android ELF
modules, which fixes the incorrect start and end addresses previously
generated by AndroidModule. Renames AndroidModule to NonElfModule.
Removes tests specific to the previous implementation.

Also includes a latent 64-bit bug fix where the register copy would
only copy half the registers.

Bug: 1004855
Change-Id: I3b26fac427043b2022b1d35b5c985e468ce35692
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253221Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783689}