Add a note on removing LLVMC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140715 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 4feb907..002d8f4 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -581,6 +581,8 @@
    from the previous release.</p>
 
 <ul>
+  <li>The <code>LLVMC</code> front end code was removed while separating
+      out language independence.</li>
   <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
       target and has been removed.</li>
   <li>The old <code>TailDup</code> pass was not used in the standard pipeline