Prepare using predicated madm for nomask IEEE fdiv/sqrt

Currently, visa generate if-endif for IEEE macro. This change will add code
that enables predicate macro sequence without using if-endif.

If there is no Early-OUT (EO, such as NaN/Inf, etc common and fast cases), the
kernel will go through madm sequences anyway,  which will have no if-endif overhead
with predicated madm.  The only case that predicated madm
would be a little worse is when all channels are EO, predicated madm would be
a few cycles more.  Also,  for noMask IEEE fdiv/sqrt, using prdicated madm
is the only choice.

This change does not turn on predicated macro yet, and has no functional change.

Author: jgu222