[PATCH] Implement Control Flow Integrity for virtual calls.

[JF Bastien]

================
Comment at: docs/ControlFlowIntegrity.rst:20
@@ +19,3 @@
+program's control flow. These schemes have been optimized for performance,
+allowing developers to enable them in release builds.
+
----------------
jfb wrote:
> Is there a reference number we can quote, or a benchmark that users can run to check what the overheads are?
Also, a warning on binary size bloat should be here.

http://reviews.llvm.org/D7424

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