* gimple-ssa-evrp-analyze.h (class evrp_range_analyzer): Add
	m_update_global_ranges member.  Add corresponding argument to ctor.
	* gimple-ssa-evrp-analyze.c
	(evrp_range_analyzer::evrp_range_analyzer): Add new argument and
	initialize m_update_global_ranges.
	(evrp_range_analyzer::set_ssa_range_info): Assert that we are
	updating global ranges.
	(evrp_range_analyzer::record_ranges_from_incoming_edge): Only
	update global ranges if explicitly requested.
	(evrp_range_analyzer::record_ranges_from_phis): Similarly.
	(evrp_range_analyzer::record_ranges_from_stmt): Similarly.
	* gimple-ssa-evrp.c (evrp_dom_walker): Pass new argument to
	evrp_range_analyzer ctor.
	* gimple-ssa-sprintf.c (sprintf_dom_walker): Similarly.
	* tree-ssa-dom.c (dom_opt_dom_walker): Similarly.

	* gcc.c-torture/builtins/strnlen.x: New file to filter -Og from
	options to test.

From-SVN: r266897