Set index_arch_AVX_Fast_Unaligned_Load only for Intel processors

Since only Intel processors with AVX2 have fast unaligned load, we
should set index_arch_AVX_Fast_Unaligned_Load only for Intel processors.

Move AVX, AVX2, AVX512, FMA and FMA4 detection into get_common_indeces
and call get_common_indeces for other processors.

Add CPU_FEATURES_CPU_P and CPU_FEATURES_ARCH_P to aoid loading
GLRO(dl_x86_cpu_features) in cpu-features.c.

	[BZ #19583]
	* sysdeps/x86/cpu-features.c (get_common_indeces): Remove
	inline.  Check family before setting family, model and
	extended_model.  Set AVX, AVX2, AVX512, FMA and FMA4 usable
	bits here.
	(init_cpu_features): Replace HAS_CPU_FEATURE and
	HAS_ARCH_FEATURE with CPU_FEATURES_CPU_P and
	CPU_FEATURES_ARCH_P.  Set index_arch_AVX_Fast_Unaligned_Load
	for Intel processors with usable AVX2.  Call get_common_indeces
	for other processors with family == NULL.
	* sysdeps/x86/cpu-features.h (CPU_FEATURES_CPU_P): New macro.
	(CPU_FEATURES_ARCH_P): Likewise.
	(HAS_CPU_FEATURE): Use CPU_FEATURES_CPU_P.
	(HAS_ARCH_FEATURE): Use CPU_FEATURES_ARCH_P.

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