Update CPUID defines after recently published 
Intel Architecture Instruction Set Extensions Programming Reference rev-021

Enable AVX-512 with all implemented extensions in generic CPUID when simd=AVX512 is supplied
implemented AVX512_IFMA532 instructions
implemented AVX512_VBMI instructions

still missing: VPMULTISHIFTQB - VBMI instruction (coming soon)

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12490 6c8e4198-a580-4521-a02f-c9ae86df1db9