Backport 3 x86 optimization patches. The first one 'Reversing calculation of __x86_shared_non_temporal_threshold' patch reverse calculation of __x86_shared_non_temporal_threshold from 3/4 of the entire shared cache size of a multi-threaded system to 3/4 of one thread's share of the cache size, and then improve the memcpy performance. The second patch 'Optimizing memcpy for AMD Zen architecture' recomputing the shareable cache as 'L3 per CCX(Core-Complex)' and improve performance for amd. The third patch 'Add Hygon Dhyana support' fix Hygon Dhyana processor CPU Vendor ID detection problem in glibc sysdep module.
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