Rebased, needs review.

On 30/08/2023 10:13, Andre Vieira (lists) via Gcc-patches wrote:
> This patch enables the compiler to use inbranch simdclones when 
> generating masked loops in autovectorization.
> 
> gcc/ChangeLog:
> 
>      * omp-simd-clone.cc (simd_clone_adjust_argument_types): Make function
>      compatible with mask parameters in clone.
>      * tree-vect-stmts.cc (vect_convert): New helper function.
>      (vect_build_all_ones_mask): Allow vector boolean typed masks.
>      (vectorizable_simd_clone_call): Enable the use of masked clones in
>      fully masked loops.