Note ARM constant island alignment in the release notes.

The command line option should be removed, but not until the feature has
gotten a lot of testing. The ARMConstantIslandPass tends to have subtle
bugs that only show up after a while.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146739 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index b9361a5..dbeba16 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -366,8 +366,8 @@
 <p>New features of the ARM target include:</p>
 
 <ul>
-  <li>....</li>
-</ul>
+  <li>The constant island pass now supports basic block and constant pool entry
+  alignments greater than 4 bytes.</li> </ul>
 </div>