OMP SIMD inbranch call vectorization for AVX512 style masks

OMP SIMD inbranch call vectorization for AVX512 style masks

The following teaches vectorizable_simd_clone_call to handle
integer mode masks.  The tricky bit is to second-guess the
number of lanes represented by a single mask argument - the following
uses simdlen and the number of mask arguments to calculate that,
assuming ABIs have them uniform.

Similar to the VOIDmode handling there's a restriction on not
supporting splitting/merging of incoming vector masks to
more/less SIMD call arguments.

	PR tree-optimization/111795
	* tree-vect-stmts.cc (vectorizable_simd_clone_call): Handle
	integer mode mask arguments.

	* gcc.target/i386/vect-simd-clone-avx512-1.c: New testcase.
	* gcc.target/i386/vect-simd-clone-avx512-2.c: Likewise.
	* gcc.target/i386/vect-simd-clone-avx512-3.c: Likewise.