Optimize google::api::expr::Unparse by removing unnecessary map copying.#1798
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…ying. `auto var = FunctionReturningConstRef();` causes a copy while `const auto& var = FunctionReturningConstRef();` does not cause any copies. Example: https://godbolt.org/z/37hETqc3q PiperOrigin-RevId: 839669874
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Optimize
google::api::expr::Unparseby removing unnecessary map copying.auto var = FunctionReturningConstRef();causes a copy whileconst auto& var = FunctionReturningConstRef();does not cause any copies. Example: https://godbolt.org/z/37hETqc3q