Oh wow, a bug in gcc!!

Objects/unicodeobject.c: In function ‘unicode_isupper_impl’:
Objects/unicodeobject.c:15661:1: internal compiler error: in create_edge, at cgraph.c:850
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-6/README.Bugs> for instructions.

I wonder if this is because the builder was updating gcc in the middle of this operation, as this looks very suspiciously related to:

New builds are OK.

On Wed, 12 Dec 2018 at 03:14, <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:

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

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

Build Reason: <unknown>
Blamelist: Ned Deily <nad@python.org>

BUILD FAILED: failed compile (failure)

 -The Buildbot
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