[PATCH] Don't inherit range-type signed-ness from underlying type

[Tom Tromey]

>>>>> "Tom" == Tom Tromey <tromey@adacore.com> writes:

Tom> 2020-10-19  Tom Tromey  <tromey@adacore.com>

Tom> 	* gdbtypes.c (create_range_type): Revert previous patch.  Add
Tom> 	comment.

I'm checking this in, with an updated comment.

Tom