MIPS: Add asub_s/u.df

These instructions are needed for implementing Sum-of-Abs-Differences
visitor.

Test: mma test-art-host-gtest
Change-Id: Ie708f30a450b0558215f59f21bb49b68c852f247
diff --git a/compiler/utils/mips64/assembler_mips64.h b/compiler/utils/mips64/assembler_mips64.h
index d67fb00..9f5e6aa 100644
--- a/compiler/utils/mips64/assembler_mips64.h
+++ b/compiler/utils/mips64/assembler_mips64.h
@@ -678,6 +678,14 @@
   void SubvH(VectorRegister wd, VectorRegister ws, VectorRegister wt);
   void SubvW(VectorRegister wd, VectorRegister ws, VectorRegister wt);
   void SubvD(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void Asub_sB(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void Asub_sH(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void Asub_sW(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void Asub_sD(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void Asub_uB(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void Asub_uH(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void Asub_uW(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void Asub_uD(VectorRegister wd, VectorRegister ws, VectorRegister wt);
   void MulvB(VectorRegister wd, VectorRegister ws, VectorRegister wt);
   void MulvH(VectorRegister wd, VectorRegister ws, VectorRegister wt);
   void MulvW(VectorRegister wd, VectorRegister ws, VectorRegister wt);