Convert TargetData::getIndexedOffset to use ArrayRef.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135478 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ReleaseNotes.html

@@ -646,6 +646,7 @@ from the previous release.</p>
 <li><code>MDNode::getIfExists</code></li>
 <li><code>MDNode::getTemporary</code></li>
 <li><code>MDNode::getWhenValsUnresolved</code></li>
+<li><code>TargetData::getIndexedOffset</code></li>
 </ul></li>
 
 <li>All forms of <code>StringMap::getOrCreateValue</code> have been remove