some lazy flags handling optimizations

git-svn-id: http://svn.code.sf.net/p/bochs/code/trunk@12518 6c8e4198-a580-4521-a02f-c9ae86df1db9
more use of the clearflagsOSZAPC

git-svn-id: http://svn.code.sf.net/p/bochs/code/trunk@12519 6c8e4198-a580-4521-a02f-c9ae86df1db9
CPUID: "Yonah" and "Atom N-270" should report max virtual address as 32-bit in leaf 0x80000008

git-svn-id: http://svn.code.sf.net/p/bochs/code/trunk@12520 6c8e4198-a580-4521-a02f-c9ae86df1db9