target/sparc: Factor sparc_cpu_gdb_write_register() out Factor sparc_cpu_gdb_write_register() out. Prefer ldn_p(target_long_bits/8) over target-specific ldtul_p(). Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-ID: <20260219191955.83815-25-philmd@linaro.org>