implementation of AVX-512 compressed displacement feature which is required for AVX-512 emu correctness (first step). todo: fix rest of EVEX opcodes

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12177 6c8e4198-a580-4521-a02f-c9ae86df1db9
cover some more opcodes with compressed displ

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12178 6c8e4198-a580-4521-a02f-c9ae86df1db9
cover some more opcodes with compressed displ

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12179 6c8e4198-a580-4521-a02f-c9ae86df1db9