MIPS64: Add ilvr.df MSA instructions

These instructions are needed for compressed string support
in ART Vectorizer.

Test: mma test-art-host-gtest
Change-Id: I269473bb8bcce5aba72201380bb71860e5498d73
diff --git a/compiler/utils/mips64/assembler_mips64.h b/compiler/utils/mips64/assembler_mips64.h
index 6ac3361..e824791 100644
--- a/compiler/utils/mips64/assembler_mips64.h
+++ b/compiler/utils/mips64/assembler_mips64.h
@@ -767,6 +767,11 @@
   void StW(VectorRegister wd, GpuRegister rs, int offset);
   void StD(VectorRegister wd, GpuRegister rs, int offset);
 
+  void IlvrB(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void IlvrH(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void IlvrW(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+  void IlvrD(VectorRegister wd, VectorRegister ws, VectorRegister wt);
+
   // Higher level composite instructions.
   int InstrCountForLoadReplicatedConst32(int64_t);
   void LoadConst32(GpuRegister rd, int32_t value);