Add Polly to release notes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144528 91177308-0d34-0410-b5e6-96231b3b80d8
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 </div>
 
 <!--=========================================================================-->
+<h3>Polly</h3>
+
+<div>
+
+<p><a href="http://polly.grosser.es">Polly</a> is an advanced data-locality
+   optimizer and automatic parallelizer. It uses an advanced, mathematical
+   model to calculate detailed data dependency information which it uses to
+   optimize the loop structure of a program. Polly can speed up sequential code
+   by improving memory locality and consequently the cache use. Furthermore,
+   Polly is able to expose different kind of parallelism which it exploits by
+   introducing (basic) OpenMP and SIMD code. A mid-term goal of Polly is to
+   automatically create optimized GPU code.</p>
+
+</div>
+
+<!--=========================================================================-->
 <h3>Portable OpenCL (pocl)</h3>
 
 <div>