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[wwwdoc][Patch] Mention Loongson 3a1000 3a2000 3a3000 2k1000 support in gcc9

Hi Gerald,

The attached patch mention Loongson 3a1000 3a2000 3a3000 2k1000 support in gcc9.

ok for commit?
Index: changes.html
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-9/changes.html,v
retrieving revision 1.30
diff -u -r1.30 changes.html
--- changes.html	3 Dec 2018 17:20:20 -0000	1.30
+++ changes.html	31 Dec 2018 10:21:32 -0000
@@ -214,6 +214,44 @@
+<h3 id="mips">MIPS</h3>
+  <li>
+    The Loongson <code>loongson-mmi</code> and <code>loongson-ext</code>
+    extension has now been splited from <code>loongson3a</code>:
+    <ul>
+       <li><code>loongson-mmi</code> which contains 
+       the Loongson MultiMedia extension Instructions operations.</li>
+       <li><code>loongson-ext</code> which contains 
+       the Loongson EXTension instructions.</li>
+    </ul>
+  <li>
+    The Loongson EXTension R2 instructions is now supported.
+    <ul>
+       <li><code>loongson-ext2</code> which contains the Loongson EXTension R2 instructions.</li>
+    </ul>
+    Use -mxxx or -mno-xxx will enable or disable those extersions.
+    for example: Using <code>-mloongson-mmi</code>/<code>-mno-loongson-mmi</code> 
+    will enable/disable Loongson MultiMedia Instructions extensions.
+  <li>
+    Support has been added for the following processors
+    (GCC identifiers in parentheses):
+    <ul>
+	<li>Loongson 3A1000 (<code>gs464</code>)
+	which default enable <code>loongson-mmi</code>, <code>loongson-ext</code>.</li>
+	<li>Loongson 3A2000/3A3000 (<code>gs464e</code>)
+	which default enable <code>loongson-mmi</code>, <code>loongson-ext</code>, <code>loongson-ext2</code>.</li>
+	<li>Loongson 2K1000 (<code>gs264e</code>)
+	which default enable <code>loongson-ext</code>, <code>loongson-ext2</code>, <code>msa</code>.</li>
+    </ul>
+    The GCC identifiers can be used
+    as arguments to the <code>-mcpu</code> or <code>-mtune</code> options,
+    for example: <code>-mcpu=gs464</code> or
+    <code>-mtune=gs464e</code> or as arguments to the equivalent target
+    attributes and pragmas.
+  </li>
 <!-- <h3 id="hsa">Heterogeneous Systems Architecture</h3> -->
 <!-- <h3 id="x86">IA-32/x86-64</h3> -->

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