Preview nounwind function attribute.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35256 91177308-0d34-0410-b5e6-96231b3b80d8

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@@ -738,8 +738,11 @@ a power of 2.</p>
     target-specific</dd>
     <dt><tt>sret</tt></dt>
     <dd>This indicates that the parameter specifies the address of a structure
-    that is the return value of the function in the source program.
-    </dd>
+    that is the return value of the function in the source program.</dd>
+    <dt><tt>nounwind</tt></dt>
+    <dd>This function attribute indicates that the function type does not use
+    the unwind instruction and does not allow stack unwinding to propagate
+    through it.</dd>
   </dl>
 
 </div>