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Commit 442e9e13 authored by Amir Ayupov's avatar Amir Ayupov
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[X86][NFC] MnemonicTables: only access RI fields if they're initialized 

Fix an issue reported by UBSan.

Test Plan:
Configure with `-DLLVM_USE_SANITIZER="Address;Undefined"`
`ninja llc`

Differential Revision: https://reviews.llvm.org/D122140
parent 0239976b
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