Implemented VSHUFF32x4/64x2, VSHUFI32x4/64x2 AVX512 instructions
Implemented AVX512 blend instructions
Do not allow setting of EVEX.b in reg form when no floating point exceptions could be generated by instruction


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12012 6c8e4198-a580-4521-a02f-c9ae86df1db9