Release notes for segmented stacks.
Patch by Sanjoy Das.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145416 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index c6657b9..faf9a4b 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -936,7 +936,10 @@
    make it run faster:</p>
 
 <ul>
-<li>XXX: Segmented stacks.</li>
+<li>LLVM can now produce code that works with libgcc
+    to <a href="SegmentedStacks.html">dynamically allocate stack
+    segments</a>, as opposed to allocating a worst-case chunk of
+    virtual memory for each thread.</li>
 <li>LLVM generates substantially better code for indirect gotos due to a new
     tail duplication pass, which can be a substantial performance win for
     interpreter loops that use them.</li>