Roll clang 354873:355581.

And adjust test expectations affected by Clang r355012 which added a
block retain optimization.

Ran `tools/clang/scripts/upload_revision.py 355581`.

Bug: 939350,939749
Change-Id: I61cf9afaed0df80230eb70c398e50ca32bd146d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1508460
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639431}
3 files changed