Strlen pass refactoring.

This refactors the strlen pass to avoid passing around as much state.
It is meant to be a start.  There's still some more refactoring
that could be done, especially in cleaning up the interface between
the strlen internals and the sprintf pass.

Tested on x86-64 Linux.

gcc/ChangeLog:

	* tree-ssa-strlen.c (class strlen_pass): Rename from
	strlen_dom_walker.
	(handle_builtin_stxncpy_strncat): Move to strlen_pass.
	(handle_assign): Same.
	(adjust_last_stmt): Same.
	(maybe_warn_overflow): Same.
	(handle_builtin_strlen): Same.
	(handle_builtin_strchr): Same.
	(handle_builtin_strcpy): Same.
	(handle_builtin_strncat): Same.
	(handle_builtin_stxncpy_strncat): Same.
	(handle_builtin_memcpy): Same.
	(handle_builtin_strcat): Same.
	(handle_alloc_call): Same.
	(handle_builtin_memset): Same.
	(handle_builtin_memcmp): Same.
	(get_len_or_size): Same.
	(strxcmp_eqz_result): Same.
	(handle_builtin_string_cmp): Same.
	(handle_pointer_plus): Same.
	(count_nonzero_bytes_addr): Same.
	(count_nonzero_bytes): Same.
	(handle_store): Same.
	(strlen_check_and_optimize_call): Same.
	(handle_integral_assign): Same.
	(check_and_optimize_stmt): Same.
	(printf_strlen_execute): Rename strlen_dom_walker to strlen_pass.

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