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6a8b2befearefactor: Avoid copying util::Result values (Ryan Ofsky)834f65e824refactor: Drop util::Result operator= (Ryan Ofsky) Pull request description: This PR just contains the first two commits of #25665. It disables copying of `util::Result` objects because unnecessary copies are inefficient and not possible after #25665, which makes `util::Result` object move-only. It disables the assignment operator and replaces it with an `Update()` method, because #25665 adds more information to `util::Result` objects (warning and error messages and failure values) and having an assignment operator that overwrites data instead of merging it would make it easy to accidentally erase existing information while trying to assign new information. ACKs for top commit: stickies-v: re-ACK6a8b2befeaachow101: ACK6a8b2befeafurszy: re-ACK6a8b2befeaTree-SHA512: 3f21af9031d50d6c68cca69133de03080f69b1ddcf8b140bdeb762069f14645209b2586037236d15b6ebd8973af0fbefd7e83144aeb7b84078a4cb4df812f984