[clang] Specicfy -o /dev/null to prevent writing to non-writeable location (PR #232710)

[Walter Lee via cfe-commits]

googlewalt wrote:

Fixes 
https://github.com/llvm/llvm-project/commit/1c3cb88e5c112a72a9efa3ca5e67a1ff0c4afb5a.

https://github.com/llvm/llvm-project/pull/232710
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