Correct the alpha sorting of the short options in the usage description of the gprof...

Correct the alpha sorting of the short options in the usage description of the gprof program.

	PR 24569
	* gprof.c (usage): Restore alphabetical sorting to short options
	list.  Add -r, -R and -t short options to the list.
	(main): Add comment about -g and -G possibly being deprecated.
	* gprof.texi: Update usage example in line with changes above.