implemented few more AVX-512 cvt opcodes

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12118 6c8e4198-a580-4521-a02f-c9ae86df1db9
cleanups

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12119 6c8e4198-a580-4521-a02f-c9ae86df1db9
fix for float32/64_to_uint32 cvt functions in softfloat

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12120 6c8e4198-a580-4521-a02f-c9ae86df1db9