[Bug tree-optimization/114769] [14 Regression] Suspicious code in vect_recog_sad_pattern() since r14-1832

[fxue at os dot amperecomputing.com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114769

--- Comment #3 from Feng Xue <fxue at os dot amperecomputing.com> ---
When half_type is null, and call chain would be:

vect_supportable_direct_optab_p (vinfo, sum_type, SAD_EXPR, NULL, ...)
  -> get_vectype_for_scalar_type (vinfo, NULL)
     -> get_related_vectype_for_scalar_type (vinfo, /*scalar_type= */NULL, ...)

       if ((!INTEGRAL_TYPE_P (scalar_type)
           && !POINTER_TYPE_P (scalar_type)
           && !SCALAR_FLOAT_TYPE_P (scalar_type))

Here will be a segfault.