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A recent change to the handling of constants in TCG changed the pattern of ops emitted for a constant add. We no longer emit a mov and the constant can be applied directly to the TCG_op_add arguments. This was causing SEGVs when running the insn plugin with arg=inline. Fix this by updating copy_add_i64 to do the right thing while also adding a comment at the top of the append section as an aide memoir if something like this happens again. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Cc: Emilio G. Cota <cota@braap.org> Message-Id: <20210213130325.14781-10-alex.bennee@linaro.org>