infra: Fix msan build

[maflcko]

Fixes #11886

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[maflcko]

The CI failure is expected, because it is timing out, and running out of space. This needs a full trial run, due to the infra change for at least msan, but doing it for everything won't hurt, I guess.

[maflcko]

Can someone please initiate a trial build? 🙏

[jonathanmetzman]

/gcbrun trial_build.py c++ c

[maflcko]

Ah, sorry, this is the branch naming thing again. Will re-open.

[maflcko]

(@jonathanmetzman see #11887 )