re PR middle-end/82123 (spurious -Wformat-overflow warning for converted vars)

re PR middle-end/82123 (spurious -Wformat-overflow warning for converted vars)

	PR middle-end/82123
	PR tree-optimization/81592
	PR middle-end/79257
	* gimple-ssa-sprintf.c: Include alloc-pool.h, vr-values.h and
	gimple-ssa-evrp-analyze.h
	(class sprintf_dom_walker): Add after_dom_children member function.
	Add evrp_range_analyzer member.
	(sprintf_dom_walker::before_dom_children): Call into the EVRP
	range analyzer as needed.
	(sprintf_dom_walker::after_dom_children): New member function.

	* gcc.dg/builtin-unreachable-6.c: Turn off VRP.

From-SVN: r257852