[DiagnosticVerifier] Fix ASAN issue in the verifier #30947
Merged
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Missed this when reviewing #30791 , but ASAN caught it here: https://ci.swift.org//job/oss-swift-incremental-ASAN-RA-osx/4602/consoleFull#-17223166953122a513-f36a-4c87-8ed7-cbc36a1ec144
This would manifest as a stack-use-after-scope because an
llvm::Twinecan't be safely stored.