[PATCH] Implement bad cast checks using control flow integrity information.

[JF Bastien]

lgtm after what seems like a typo.


================
Comment at: test/CodeGenCXX/cfi-cast.cpp:58
@@ +57,3 @@
+  // CHECK-DCAST: ret
+  static_cast<B&>(a);
+}
----------------
`B&&`

http://reviews.llvm.org/D8312

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