bug#39179: 27.0.50; [PATCH] Add filter to gdb-mi register buffer

[Yuan Fu]

By default the register buffer of gdb-mi displays all the registers. This patch 
allows a user to choose what to display: by enabling a filter. More information 
is included in the commit message.

register-filter.patch
Description: Binary data

In GNU Emacs 27.0.50 (build 3, x86_64-apple-darwin19.0.0, NS appkit-1894.10 
Version 10.15.1 (Build 19B88))
of 2019-11-30 built on missSilver
Repository revision: e2828795d73637577c7726965974a047fe2d7119
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1894
System Description:  Mac OS X 10.15.2

Recent messages:
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Configured using:
'configure --with-modules --with-pdumper=yes
--oldincludedir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/libxml2/'

Configured features:
NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES
THREADS PDUMPER LCMS2

Important settings:
  value of $LC_CTYPE: UTF-8
  value of $LANG: en_CN.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
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  outshine-mode: t
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  minions-mode: t
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  hl-todo-mode: t
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  general-override-mode: t
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  ivy-mode: t
  company-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-quote-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  transient-mark-mode: t
  hs-minor-mode: t

Load-path shadows:
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/Users/yuan/.emacs.d/ranch/windman/windman
/Users/yuan/.emacs.d/ranch/nerd-font/test/test-helper hides 
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/Users/yuan/.emacs.d/ranch/julia-mode/julia-mode hides 
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/Users/yuan/.emacs.d/ranch/matlab-emacs/mlint hides 
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/Users/yuan/.emacs.d/ranch/matlab-emacs/linemark hides 
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/Users/yuan/.emacs.d/ranch/matlab-emacs/semanticdb-matlab hides 
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/Users/yuan/.emacs.d/ranch/matlab-emacs/semantic-matlab hides 
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/Users/yuan/.emacs.d/ranch/matlab-emacs/srecode-matlab hides 
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/Users/yuan/.emacs.d/ranch/matlab-emacs/matlab hides 
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/Users/yuan/.emacs.d/ranch/matlab-emacs/cedet-matlab hides 
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/Users/yuan/.emacs.d/ranch/matlab-emacs/tlc hides 
/Users/yuan/.emacs.d/package/matlab-mode-20180928.1526/tlc
/Users/yuan/.emacs.d/ranch/matlab-emacs/matlab-publish hides 
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/Users/yuan/.emacs.d/ranch/matlab-emacs/matlab-mode-pkg hides 
/Users/yuan/.emacs.d/package/matlab-mode-20180928.1526/matlab-mode-pkg
/Users/yuan/.emacs.d/package/faceup-20170925.1946/faceup hides 
/Users/yuan/attic/emacs/lisp/emacs-lisp/faceup

Features:
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vc-mtn vc-hg ffap tramp tramp-loaddefs trampver tramp-integration
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emacsbug sendmail vc-git vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs vc
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mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log with-editor
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text-mode-expansions the-org-mode-expansions er-basic-expansions
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eyebrowse savehist buffer-move windmove hl-todo highlight-parentheses
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text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads kqueue cocoa ns
lcms2 multi-tty make-network-process emacs)

Memory information:
((conses 16 198126 23690)
(symbols 48 9373 50)
(strings 32 38317 1952)
(string-bytes 1 1116054)
(vectors 16 24583)
(vector-slots 8 288178 27922)
(floats 8 506 310)
(intervals 56 14663 1329)
(buffers 1000 26))