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[arm] Mention -mfpu=auto in release notes

This patch updates the release notes to mention that -mfpu=auto has been
added and that it is now the default.


? htdocs/backends.html~
? htdocs/index.html.~1.866.~
? htdocs/readings.html.~1.261.~
? htdocs/svn.html.~1.183.~
? htdocs/svn.html~
Index: htdocs/gcc-8/changes.html
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-8/changes.html,v
retrieving revision 1.4
diff -u -p -r1.4 changes.html
--- htdocs/gcc-8/changes.html	4 May 2017 14:35:22 -0000	1.4
+++ htdocs/gcc-8/changes.html	20 Jun 2017 10:17:54 -0000
@@ -82,7 +82,18 @@ a work-in-progress.</h2>
 <h3 id="arm">ARM</h3>
-  <li></li>
+  <li>
+    The <code>-mfpu</code> option now takes a new option setting of
+    <code>-mfpu=auto</code>.  When set to this the floating-point and SIMD
+    settings are derived from the settings of the <code>-mcpu</code>
+    or <code>-march</code> options.  The internal CPU configurations have been
+    updated with information about the permitted floating-point configurations
+    supported.  See the user guide for further information about the extended
+    option syntax for controlling architectural extensions via the
+    <code>-march</code> option.  <code>-mfpu=auto</code> is now the default
+    setting unless the compiler has been configured with an explicit
+    <code>--with-fpu</code> option.
+  </li>
 <!-- <h3 id="avr">AVR</h3> -->

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