* config/i386/cpuid.h (__cpuid): Remove definitions that handle %ebx
	register in a special way.
	(__cpuid_count): Ditto.
	* config/i386/driver-i386.h: Protect with
	"#if defined(__GNUC__) && (__GNUC__ >= 5 || !defined(__PIC__))".
	(host_detect_local_cpu): Mention that GCC with non-fixed %ebx
	is required to compile the function.

From-SVN: r216362