Add mangling for fixed point types proposed in N1169.

abi.html

@@ -612,6 +612,13 @@ <h3><a href="#docs"> 1.5 Base Documents </a></h3>
 References herein to the "C++ Standard," or to just the "Standard,"
 are to this document.
 
+<p>
+<li> [N1169]
+The <b>Programming languages - C - Extensions to support embedded processors</b>,
+ISO/IEC JTC1 SC22 WG14 N1169.
+This document describes extentions to the C language for supporting embedded
+processors, notably including support for fixed point arithmetic.
+
 </ul>
 
 
@@ -5136,7 +5143,17 @@ <h5><a href="#mangling-builtin">5.1.5.2 Builtin types</a></h5>
                  ::= Da # auto
                  ::= Dc # decltype(auto)
                  ::= Dn # std::nullptr_t (i.e., decltype(nullptr))
+                 ::= [DS] DA <fixed-point-size> # N1169 fixed-point [_Sat] T _Accum
+                 ::= [DS] DR <fixed-point-size> # N1169 fixed-point [_Sat] T _Fract
 		 ::= u &lt;<a href="#mangle.source-name">source-name</a>&gt; [&lt;<a href="#mangle.template-args">template-args</a>&gt;] # vendor extended type
+
+  &lt;<a name="mangle.fixed-point-size">fixed-point-size</a>&gt;
+                 ::= s # short
+                 ::= t # unsigned short
+                 ::= i # plain
+                 ::= j # unsigned
+                 ::= l # long
+                 ::= m # unsigned long
 </pre></font></code>
 
 <p>