Update the release notes to note the change from TargetData to DataLayout.

llvm-svn: 166702

llvm/docs/ReleaseNotes.html

@@ -669,6 +669,9 @@ Release Notes</a>.</h1>
   "TargetTransformInfo" provides a number of low-level interfaces.
   LSR and LowerInvoke already use the new interface. </p>
 
+<p> The TargetData structure has been renamed to DataLayout and moved to VMCore
+to remove a dependency on Target. </p>
+
 <ul>
   <li>...</li>
 </ul>