[PATCH v4 1/4] reggroups: Add test and docs for `info reg $reggroup` feature

[Eli Zaretskii]

> From: Stafford Horne <shorne@gmail.com>
> Cc: Simon Marchi <simon.marchi@polymtl.ca>,
> 	Eli Zaretskii <eliz@gnu.org>,
> 	Stafford Horne <shorne@gmail.com>
> Date: Tue, 26 Dec 2017 22:48:29 +0900
> 
> Until now this feature has existed but was not documented.  Adding docs
> and tests.
> 
> gdb/ChangeLog:
> 
> yyyy-mm-dd  Stafford Horne  <shorne@gmail.com>
> 
> 	* infcmd.c (_initialize_infcmd): Add help for info reg $reggroup
> 	and info all-registers $reggroup feature.
> 
> gdb/doc/ChangeLog:
> 
> yyyy-mm-dd  Stafford Horne  <shorne@gmail.com>
> 
> 	* gdb.texinfo (Registers): Document info reg $reggroup feature.
> 
> gdb/testsuite/ChangeLog:
> 
> yyyy-mm-dd  Stafford Horne  <shorne@gmail.com>
> 
> 	* gdb.base/reggroups.c: New file.
> 	* gdb.base/reggroups.exp: New file.

OK for the documentation parts, thanks.