Don't add dependencies in update_stmt.

gimple_ranger::update_stmt has no idea what the context of an update
is, and should not be adding relations when it re-evaluates a stmt.

	PR tree-optimization/107523
	gcc/
	* gimple-range.cc (gimple_ranger::update_stmt): Use fur_stmt
	rather than fur_depend.

	gcc/testsuite/
	* gcc.dg/pr107523.c: New.