ART: Fix addpd opcode, add Quick x86 assembler test

This patch fixes the addpd opcode that may be used by vectorizations,
and adds an assembler test for the Quick x86 assembler, currently
lightly testing addpd, subpd and mulpd.

Change-Id: I29455a86212829c75fd75737679280f167da7b5b
Signed-off-by: Chao-ying Fu <chao-ying.fu@intel.com>
diff --git a/compiler/dex/mir_graph.h b/compiler/dex/mir_graph.h
index 7f9698b..7bfbb34 100644
--- a/compiler/dex/mir_graph.h
+++ b/compiler/dex/mir_graph.h
@@ -1451,6 +1451,7 @@
   friend class TopologicalSortOrderTest;
   friend class TypeInferenceTest;
   friend class QuickCFITest;
+  friend class QuickAssembleX86TestBase;
 };
 
 }  // namespace art