libc++errors in CI

[tschuett]

I have libc++ errors in my PR: #110287.
Even after several force pushes, they do not go away. I claim that they are unrelated, but CI is red.

[frederick-vs-ja]

I encountered the same error (error: no type named 'type' in 'std::common_type<long double, long double, long>') yesterday.

#107638 (reverted by #110384 recently) may be related. I guess you can retry force-pushing now.

[ldionne]

@frederick-vs-ja is right, the errors were caused by a libc++ change and I am currently investigating. The errors will be fixed when I re-land the changes in #110501.