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.
