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Fix error found by new clang operator precendence warning

Description

Fix error found by new clang operator precendence warning

error: operator '?:' has lower precedence than '|'; '|' will be evaluated first

I discovered this in CheriBSD after updating our fork of clang to the latest
upstream master.

Reviewed By: ian
Differential Revision: https://reviews.freebsd.org/D22433

Details