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H A Dtranslate.ce0efc48f Thu Jul 08 16:34:29 CDT 2021 Richard Henderson <richard.henderson@linaro.org> target/openrisc: Use dc->zero in gen_add, gen_addc

We still need the t0 temporary for computing overflow,
but we do not need to initialize it to zero first.

Reviewed-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>