[PATCH] x86: Support Zhaoxin PadLock XMODX instructions

[Mayshao-oc]

Hi all:
     This patch adds support for Zhaoxin XMODX instructions.
     The CPUID EDX bit[28] indicates its enablement, and it includes REP
XMODEXP and REP MONTMUL2. XMODX stands for modular exponentiation, it indicates 
the support of modular exponentiation feature, both REP XMODEXP and 
REP MONTMUL2 use it.
     Test ok, ok for trunk?
BR
MayShao
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