Following patch documents store merging improvements, -fsanitize=builtin,
-fsanitize=pointer-overflow and C++2A progress.

Ok for wwwdocs?

--- changes.html        3 Apr 2018 06:52:04 -0000       1.51
+++ changes.html        4 Apr 2018 07:41:06 -0000
@@ -113,6 +113,21 @@ a work-in-progress.</h2>
     possible for the user to have a finer-grained control over the loop
     unrolling optimization.
+  <li>
+    The store merging pass has been enhanced to handle bitfields and not
+    just constant stores, but also data copying from adjacent memory
+    locations into other adjacent memory locations, including bitwise
+    logical operations on the data.  The pass can also handle byte swapping
+    into memory locations.
+  </li>
+  <li>
+    The undefined behavior sanitizer gained two new options included in
+    <code>-fsanitize=undefined</code>: <code>-fsanitize=builtin</code> which
+    diagnoses at runtime invalid arguments to <code>__builtin_clz</code> or
+    <code>__builtin_ctz</code> prefixed builtins, and
+    <code>-fsanitize=pointer-overflow</code> which performs cheap runtime
+    tests for pointer wrapping.
+  </li>
@@ -187,7 +202,17 @@ a work-in-progress.</h2>
 <h3 id="cxx">C++</h3>
-  <li></li>
+  <li>
+    The C++ front end has experimental support for some of the upcoming C++2a
+    draft features with the <code>-std=c++2a</code> or 
+    flags, including designated initializers, default member initializers for
+    bit-fields, <code>__VA_OPT__</code> (except that
+    <code>#__VA_OPT__</code> is unsupported), lambda <code>[=, this]</code>
+    captures, etc.
+    For a full list of new features,
+    see <a href="https://gcc.gnu.org/projects/cxx-status.html#cxx2a";>the C++
+    status page</a>.
+  </li>
 <h3 id="fortran">Fortran</h3>


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