Implemented XSAVEC instruction emulation and XINUSE optimization in the XSAVEOPT instruction


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12247 6c8e4198-a580-4521-a02f-c9ae86df1db9
check if XMM reg is clear using dedicated function

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12248 6c8e4198-a580-4521-a02f-c9ae86df1db9