code reorg : take laddr calculation out of 64-bit memory handlers. this creates generic linear address memory handlers which now could be used elsewhere

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12515 6c8e4198-a580-4521-a02f-c9ae86df1db9
update (c)

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12516 6c8e4198-a580-4521-a02f-c9ae86df1db9