Remove "add-shared-symbol-files", "dll-symbols" and "assf" commands doc.

This patch removes documentation from some commands whose support has
been recently removed.

gdb/ChangeLog:

        * NEWS: Document removal of "dll-symbols", "add-shared-symbol-files"
        and "assf" commands.

gdb/doc/ChangeLog:

        * gdb.texinfo (Files): Remove documentation of the
        "add-shared-symbol-files" and "assf" commands.
        (Cygwin Native): Remove documentation of the "dll-symbols"
        command.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2014-12-31  Joel Brobecker  <brobecker@adacore.com>
+
+	* NEWS: Document removal of "dll-symbols", "add-shared-symbol-files"
+	and "assf" commands.
+
 2014-12-30  Joel Brobecker  <brobecker@adacore.com>
 
 	* windows-nat.c (safe_symbol_file_add_stub)

gdb/NEWS

@@ -109,6 +109,10 @@ SGI Irix-6.x				mips-*-irix6*
 VAX running (4.2 - 4.3 Reno) BSD 	vax-*-bsd*
 VAX running Ultrix 			vax-*-ultrix*
 
+* The "dll-symbols" command, and its two aliases ("add-shared-symbol-files"
+  and "assf"), have been removed.  Use the "sharedlibrary" command, or
+  its alias "share", instead.
+
 *** Changes in GDB 7.8
 
 * New command line options

gdb/doc/ChangeLog

@@ -1,3 +1,10 @@
+2014-12-31  Joel Brobecker  <brobecker@adacore.com>
+
+	* gdb.texinfo (Files): Remove documentation of the
+	"add-shared-symbol-files" and "assf" commands.
+	(Cygwin Native): Remove documentation of the "dll-symbols"
+	command.
+
 2014-12-17  Doug Evans  <xdje42@gmail.com>
 
 	* gdb.texinfo (Debugging Output): Document "debug symbol-lookup".

gdb/doc/gdb.texinfo

@@ -17390,22 +17390,6 @@ evaluation yields the address of the file's shared object file header.
 For this command to work, you must have used @code{symbol-file} or
 @code{exec-file} commands in advance.
 
-@kindex add-shared-symbol-files
-@kindex assf
-@item add-shared-symbol-files @var{library-file}
-@itemx assf @var{library-file}
-This command is deprecated and will be removed in future versions
-of @value{GDBN}.  Use the @code{sharedlibrary} command instead.
-
-The @code{add-shared-symbol-files} command can currently be used only
-in the Cygwin build of @value{GDBN} on MS-Windows OS, where it is an
-alias for the @code{dll-symbols} command (@pxref{Cygwin Native}).
-@value{GDBN} automatically looks for shared libraries, however if
-@value{GDBN} does not find yours, you can invoke
-@code{add-shared-symbol-files}.  It takes one argument: the shared
-library's file name.  @code{assf} is a shorthand alias for
-@code{add-shared-symbol-files}.
-
 @kindex section
 @item section @var{section} @var{addr}
 The @code{section} command changes the base address of the named
@@ -20378,14 +20362,6 @@ selector for 32-bit programs and @code{$gs} for 64-bit programs).
 @item info dll
 This is a Cygwin-specific alias of @code{info shared}.
 
-@kindex dll-symbols
-@item dll-symbols
-This command is deprecated and will be removed in future versions
-of @value{GDBN}.  Use the @code{sharedlibrary} command instead.
-
-This command loads symbols from a dll similarly to
-add-sym command but without the need to specify a base address.
-
 @kindex set cygwin-exceptions
 @cindex debugging the Cygwin DLL
 @cindex Cygwin DLL, debugging