config.gcc (visium-*-*): Enable --with-cpu option, accept gr5 and gr6 as possible values, defaulting to gr5.
* config.gcc (visium-*-*): Enable --with-cpu option, accept gr5 and
gr6 as possible values, defaulting to gr5. Set target_cpu_default2.
* config/visium/visium.h (OPTION_DEFAULT_SPECS): Define.
(TARGET_CPU_gr5): Likewise.
(TARGET_CPU_gr6): Likewise.
(MULTILIB_DEFAULTS): Likewise.
* config/visium/t-visium (MULTILIB_OPTIONS): Request distinct variants
for mcpu=gr5 and mcpu=gr6.
(MULTILIB_DIRNAMES): Adjust accordingly.
From-SVN: r227728