Revert "Reland "Roll clang 365097:368354.""

This reverts commit b897e9bf67b6c0dc04269e9527e9e9064cd76af1.

Reason for revert: Bisecting pinpoints this CL as responsible for breaking WebKit Linux MSAN. See https://ci.chromium.org/p/chromium/builders/ci/WebKit%20Linux%20MSAN/1194 for the first failure caused by it. Please run the linux-webkit-msan-rel tryjob and ensure it passes before resubmitting.

Original change's description:
> Reland "Roll clang 365097:368354."
> 
> This is a reland of 5c7654a48b01a46a7b26a5c37dcad2c17b12ee64
> 
> I moved the -momit-leaf-pointer flag so that it is not redundant
> with -fomit-frame-pointer and the x86-only warning doesn't occur.
> 
> Original change's description:
> > Roll clang 365097:368354.
> >
> > Update the released clang version to 10.0.0.
> >
> > Binary-Size: crbug.com/992372, compiler update adds 32KB, seems reasonable
> > Bug: 983371
> > Change-Id: I378b4e30ec045e9206ba11b77a95d81dc3008f1d
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713302
> > Reviewed-by: Nico Weber <thakis@chromium.org>
> > Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> > Commit-Queue: Reid Kleckner <rnk@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#685744}
> 
> Bug: 983371
> Change-Id: Ia2d628b4710033de4b80700de7bd96bbe5d9d73f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747138
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Commit-Queue: Reid Kleckner <rnk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#685783}

TBR=thakis@chromium.org,hans@chromium.org,rnk@chromium.org,dpranke@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 983371
Change-Id: I36911cf6042bd8fddbde923f83d68e221b5fc993
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747491
Reviewed-by: Fergus Dall <sidereal@google.com>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Original-Commit-Position: refs/heads/master@{#685909}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: e0e3d85599361c275320594e7fc8b27a2e7056bb
3 files changed