gccint.texi: add user experience guidelines

gcc/ChangeLog:
	* Makefile.in (TEXI_GCCINT_FILES): Add ux.texi.
	* doc/gccint.texi: Include ux.texi and use it in top-level menu.
	* doc/ux.texi: New file.

From-SVN: r265322

gcc/ChangeLog

+2018-10-19  David Malcolm  <dmalcolm@redhat.com>
+
+	* Makefile.in (TEXI_GCCINT_FILES): Add ux.texi.
+	* doc/gccint.texi: Include ux.texi and use it in top-level menu.
+	* doc/ux.texi: New file.
+
 2018-10-19  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* config/rs6000/rs6000.h (REG_ALLOC_ORDER): Move 68 (that is, CR0) to

gcc/Makefile.in

@@ -3134,7 +3134,7 @@ TEXI_GCCINT_FILES = gccint.texi gcc-common.texi gcc-vers.texi		\
 	 gnu.texi gpl_v3.texi fdl.texi contrib.texi languages.texi	\
 	 sourcebuild.texi gty.texi libgcc.texi cfg.texi tree-ssa.texi	\
 	 loop.texi generic.texi gimple.texi plugins.texi optinfo.texi   \
-	 match-and-simplify.texi poly-int.texi
+	 match-and-simplify.texi ux.texi poly-int.texi
 
 TEXI_GCCINSTALL_FILES = install.texi install-old.texi fdl.texi		\
 	 gcc-common.texi gcc-vers.texi

gcc/doc/gccint.texi

@@ -125,6 +125,7 @@ Additional tutorial information is linked to from
 * LTO::             Using Link-Time Optimization.
 
 * Match and Simplify:: How to write expression simplification patterns for GIMPLE and GENERIC
+* User Experience Guidelines:: Guidelines for implementing diagnostics and options.
 * Funding::         How to help assure funding for free software.
 * GNU Project::     The GNU Project and GNU/Linux.
 
@@ -162,6 +163,7 @@ Additional tutorial information is linked to from
 @include plugins.texi
 @include lto.texi
 @include match-and-simplify.texi
+@include ux.texi
 
 @include funding.texi
 @include gnu.texi