PR tree-optimization/86400 - set<string>::set<char (*)[2]) constructor does not work with array argument

gcc/ChangeLog:
	* tree-ssa-strlen.c (maybe_set_strlen_range): Use type size rather
	than its domain to compute its the upper bound of a char array.

gcc/testsuite/ChangeLog:
	* gcc.dg/strlenopt-47.c: New test.
	* gcc.dg/strlenopt-48.c: New test.

From-SVN: r262438