Implement CFI for Quick.

CFI is necessary for stack unwinding in gdb, lldb, and libunwind.

Change-Id: Ic3b84c9dc91c4bae80e27cda02190f3274e95ae8
diff --git a/compiler/dex/mir_graph.h b/compiler/dex/mir_graph.h
index d4a9eb9..95cff0a 100644
--- a/compiler/dex/mir_graph.h
+++ b/compiler/dex/mir_graph.h
@@ -1463,6 +1463,7 @@
   friend class GvnDeadCodeEliminationTest;
   friend class LocalValueNumberingTest;
   friend class TopologicalSortOrderTest;
+  friend class QuickCFITest;
 };
 
 }  // namespace art