Subzero. X86. Lowers shufflevector using xmm instructions.

src/IceAssemblerX86Base.h

Index: src/IceAssemblerX86Base.h
diff --git a/src/IceAssemblerX86Base.h b/src/IceAssemblerX86Base.h
index 265085db942294bc58d5cb2ec462eba24cdac6ff..bd56dbc7f7af5318f31c258342788182d056aee6 100644
--- a/src/IceAssemblerX86Base.h
+++ b/src/IceAssemblerX86Base.h
@@ -432,6 +432,8 @@ public:
   void pshufd(Type Ty, XmmRegister dst, XmmRegister src, const Immediate &mask);
   void pshufd(Type Ty, XmmRegister dst, const Address &src,
               const Immediate &mask);
+  void punpckldq(Type, XmmRegister Dst, XmmRegister Src);
+  void punpckldq(Type, XmmRegister Dst, const Address &Src);
   void shufps(Type Ty, XmmRegister dst, XmmRegister src, const Immediate &mask);
   void shufps(Type Ty, XmmRegister dst, const Address &src,
               const Immediate &mask);