implemented avx-512 gather/scatter

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12003 6c8e4198-a580-4521-a02f-c9ae86df1db9
fixed corrupted fetchdecode from svn rev12001

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12004 6c8e4198-a580-4521-a02f-c9ae86df1db9
fixed typo bug in xmm accessor definition

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12005 6c8e4198-a580-4521-a02f-c9ae86df1db9
extend movddup/sldup/shdup to 512-bit vlen

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12006 6c8e4198-a580-4521-a02f-c9ae86df1db9