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The current logic in library_loader_hooks.cc for when to fork and
prefetch the native library has gotten complicated. This CL simplifies
it to current best practice: The prefetching is always done, restricted
to the ordered code if --orderfile-memory-optimization is set.

Bug: 758566
Change-Id: I86ecfff37b18eb7bda1edadfa5399db97b8be53e
Reviewed-on: https://chromium-review.googlesource.com/1095256Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567274}