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memfd_create() avoids having to write relocations to disk. It is available on
recent-ish Android kernels (>= 3.17). Use it where possible in ModernLinker.

Bug: 979638
Change-Id: I6b52373490bec0c29b9028558d3926fff75d7a4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730893Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Egor Pasko <pasko@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684352}