Add function context for querying global ranges.

Add function context for querying global ranges.

When processing arguments for assume functions, call get_global_range
directly and utilize a function context pointer to avoid any assumptions
about using cfun.

	PR tree-optimization/108520
	gcc/
	* gimple-range-infer.cc (check_assume_func): Invoke
	gimple_range_global directly instead using global_range_query.
	* value-query.cc (get_range_global): Add function context and
	avoid calling nonnull_arg_p if not cfun.
	(gimple_range_global): Add function context pointer.
	* value-query.h (imple_range_global): Add function context.

	gcc/testsuite/
	* g++.dg/pr108520.C: New.