[PATCH] Mention address space related changes in release notes.

[Matt Arsenault]

Hi void,

http://llvm-reviews.chandlerc.com/D2195

Files:
  docs/ReleaseNotes.rst

Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -83,6 +83,13 @@
 * FileCheck now allows specifing -check-prefix multiple times. This
   helps reduce duplicate check lines when using multiple RUN lines.
 
+* The bitcast instruction no longer allows casting between pointers
+   with different address spaces. To achieve this, use the new
+   addrspacecast instruction.
+
+* Different sized pointers for different address spaces should now
+  generally work. This is primarily useful for GPU targets.
+
 * ... next change ...
 
 .. NOTE
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