the ls009 RFC is underway but some of the REMAP Modes
need a comprehensive review to check if they are redundant,
and if so to remove them.
this is important because the svshape instruction is under
pressure and there are future capabilities that need adding.
sorted, completed review and removed the two redundant options.
a number of unit tests were removed, they had duplicates with
the more efficient DCT modes. one setvl unit test also used
the legacy mode .