target-insns.def (prefetch): New targetm instruction pattern.

target-insns.def (prefetch): New targetm instruction pattern.

gcc/
	* target-insns.def (prefetch): New targetm instruction pattern.
	* tree-ssa-loop-prefetch.c: Include targeth.
	(tree_ssa_prefetch_arrays): Use prefetch targetm pattern instead
	of HAVE_*/gen_* interface.
	* builtins.c (expand_builtin_prefetch): Likewise.
	* toplev.c (process_options): Likewise.

From-SVN: r225424