implemented avx-512 masked load instructions

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@11971 6c8e4198-a580-4521-a02f-c9ae86df1db9
fixed typos causing compilation err

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@11972 6c8e4198-a580-4521-a02f-c9ae86df1db9
fixed memory access decoding in presence of evex prefix

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@11973 6c8e4198-a580-4521-a02f-c9ae86df1db9