[clang] [clang:ast] Avoid warning for unused var without assertions. (NFC) (PR #169822)

[Simon Pilgrim via cfe-commits]

Ingo =?utf-8?q?Müller?= <ingomueller at google.com>
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https://github.com/RKSimon auto_merge_enabled https://github.com/llvm/llvm-project/pull/169822