To be able to split some code calling the gen_helper() macros
out of the huge translate.c, we need to define them in the
'translate.h' local header.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210816205107.2051495-9-f4bug@amsat.org>