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Variably length arrays tend be less efficient than alloca(); see
https://www.phoronix.com/scan.php?page=news_item&px=Linux-Kills-The-VLA

BUG=none
TEST=cq
R=sergeyu

Change-Id: Ibb16415b960b1ab5b262fab39537c7cf63ce5586
Reviewed-on: https://chromium-review.googlesource.com/c/1324196
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606197}