Add size_no_ltcg optimize config
Add size_no_ltcg optimize config

This is pulled out of https://codereview.chromium.org/1149693004/.

It needs to be landed separately first, then ffmpeg updated to use this
config, then the above CL landed.

Currently 'size_no_ltcg' is an exact copy of 'size'. Size will be changed
in a subsequent CL after https://gerrit.chromium.org/gerrit/#/c/74469/
lands and rolls.

(ffmpeg currently fails to build for messy reasons, see issue 264459 for
details. For now, we just excluded it.)

R=cpu@chromium.org
BUG=490934, 264459

Review URL: https://codereview.chromium.org/1148403004

Cr-Commit-Position: refs/heads/master@{#331415}
(cherry picked from commit 7d488d2ac14743faf974e503f4f459623e41a2ab)

Review URL: https://codereview.chromium.org/1181833002.

Cr-Commit-Position: d34a0005849006230ae7ffb1a9693419810a06bc@{#287}
Cr-Branched-From: 40cda19e609fd36fbf5fe489055423e611631abc@{#330231}

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