Add blurb for LLVM D Compiler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156733 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 2374efe..b1083da 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -290,6 +290,16 @@
 
 </div>
 
+<h3>LLVM D Compiler</h3>
+
+<div>
+
+<p><a href="https://github.com/ldc-developers/ldc">LLVM D Compiler</a> (LDC) is
+   a compiler for the D programming Language. It is based on the DMD frontend
+   and uses LLVM as backend.</p>
+
+</div>
+
 <h3>Open Shading Language</h3>
 
 <div>