x86: Update __x86_shared_non_temporal_threshold

__x86_shared_non_temporal_threshold was set to 6 times of per-core
shared cache size, based on the large memcpy micro benchmark in glibc
on a 8-core processor.  For a processor with more than 8 cores, the
threshold is too low.  Set __x86_shared_non_temporal_threshold to the
3/4 of the total shared cache size so that it is unchanged on 8-core
processors.  On processors with less than 8 cores, the threshold is
lower.

	* sysdeps/x86/cacheinfo.c (__x86_shared_non_temporal_threshold):
	Set to the 3/4 of the total shared cache size.

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