Convert Walloca pass to get_range_query.

Convert Walloca pass to get_range_query.

This patch converts the Walloca pass to use an on-demand ranger
accesible with get_range_query instead of having to create a ranger and pass
it around.

gcc/ChangeLog:

	* gimple-ssa-warn-alloca.c (alloca_call_type): Use
	  get_range_query instead of query argument.
	(pass_walloca::execute): Enable and disable global ranger.

gcc/testsuite/ChangeLog:

	* gcc.dg/Wstringop-overflow-55.c: Adapt for range query changes.
	* gcc.dg/pr80776-1.c: Same.