[PATCH] x86: Support Zhaoxin PadLock PHE2 instructions

[Mayshao-oc]

Hi all:
     This patch adds support for Zhaoxin PadLockPHE2 instructions.
     The CPUID EDX bit[26] indicates its enablement, and it includes REP
XSHA384 and REP XSHA512.
     Test ok, ok for trunk?
BR
MayShao
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