PR tree-optimization/79352 - -fprintf-return-value doesn't handle flexible-like array members properly

gcc/ChangeLog:

	PR tree-optimization/79352
	* gimple-fold.c (get_range_strlen): Add argument.
	(get_range_strlen): Change return type to bool.
	(get_maxval_strlen): Pass in a dummy argument.
	* gimple-fold.h (get_range_strlen): Change return type to bool.
	* gimple-ssa-sprintf.c (get_string_length): Set unlikely counter.
	* tree.h (array_at_struct_end_p): Add argument.
	* tree.c (array_at_struct_end_p): Handle it.

gcc/testsuite/ChangeLog:

	PR tree-optimization/79352
	* gcc.dg/tree-ssa/pr79352.c: New test.

From-SVN: r245156