vect: Use inbranch simdclones in masked loops

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_build_all_ones_mask): Allow vector boolean
	typed masks.
	(vectorizable_simd_clone_call): Enable the use of masked clones in
	fully masked loops.