* value-prof.c (tree_stringops_transform): New.
	(tree_value_profile_transformations): Require count to be non-zero;
	call stringop transform; reset stmt BSI after BB changed.
	(tree_divmod_fixed_value, tree_mod_pow2): Don't emit unnecesary label.
	(interesting_stringop_to_profile_p, tree_stringop_fixed_value): New.
	(tree_stringops_values_to_profile): New.
	(tree_values_to_profile): Call tree_stringops_values_to_profile.
	* tree.h (build_string_literal): Tidy prototype.
	(validate_arglist, builtin_memset_read_str, get_pointer_alignment):
	Declare.
	* builtins.c (validate_arglist, builtin_memset_read_str,
	get_pointer_alignment): Export.

From-SVN: r119735