Looks like some corrupted PGO data failure, maybe due to the filesystem:

Objects/unicodeobject.c:1:0: error: Profile data for function 353291628 is corrupted
 /*
 Objects/unicodeobject.c:1:0: error: number of counters is 1 instead of 2

New builds are OK.

On Fri, 28 Dec 2018 at 04:55, <buildbot@python.org> wrote:
The Buildbot has detected a failed build on builder AMD64 Debian PGO 3.7 while building python/cpython.
Full details are available at:
    https://buildbot.python.org/all/#builders/128/builds/915

Buildbot URL: https://buildbot.python.org/all/

Worker for this Build: gps-debian-profile-opt

Build Reason: <unknown>
Blamelist: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>

BUILD FAILED: failed compile (failure)

Sincerely,
 -The Buildbot
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