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This patches removes old hugepage mechanism that works without
orderfiles. So now, enabling orderfile == enabling THP.

Bug: 1100803
Test: Build chrome os locally
Change-Id: Ib4ff215b10ccc4c3c51347357a0cba7f51ec6793
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369335
Commit-Queue: Tiancong Wang <tcwang@google.com>
Reviewed-by: George Burgess <gbiv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800740}