[visium] Add --with-cpu configure option

Eric Botcazou ebotcazou@adacore.com
Sun Sep 13 17:19:00 GMT 2015

Self-explanatory, tested on visium-elf, applied on the mainline.

2015-09-13  Olivier Hainque  <hainque@adacore.com>
            Eric Botcazou  <ebotcazou@adacore.com>

	* 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.
	* config/visium/t-visium (MULTILIB_OPTIONS): Request distinct variants
	for mcpu=gr5 and mcpu=gr6.
	(MULTILIB_DIRNAMES): Adjust accordingly.

Eric Botcazou
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