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It was bumped in LLVM r321712.

TBR=thakis,rnk

Bug: none
Change-Id: Ief1c0855a99be9d23330b91b8e804348a070822c
Reviewed-on: https://chromium-review.googlesource.com/848748Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526707}