Added shape of implementation for last missing VSCALEF* AVX-512 instructons.
The softfloat implementation is still missing (only corner cases are supported).
Extend softfloat floatNN_class methods to distinguish between SNaN and QNaN.

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12234 6c8e4198-a580-4521-a02f-c9ae86df1db9