[turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

src/ia32/assembler-ia32.h

Index: src/ia32/assembler-ia32.h
diff --git a/src/ia32/assembler-ia32.h b/src/ia32/assembler-ia32.h
index ea5a7e25933a0301b2abc8f70ba90663e030415a..41b83481b2dbd4e736aaed98d8454a0c6e9f68e0 100644
--- a/src/ia32/assembler-ia32.h
+++ b/src/ia32/assembler-ia32.h
@@ -1018,6 +1018,9 @@ class Assembler : public AssemblerBase {
   void cmpltsd(XMMRegister dst, XMMRegister src);
   void pcmpeqd(XMMRegister dst, XMMRegister src);
 
+  void punpckldq(XMMRegister dst, XMMRegister src);
+  void punpckhdq(XMMRegister dst, XMMRegister src);
+
   void movdqa(XMMRegister dst, const Operand& src);
   void movdqa(const Operand& dst, XMMRegister src);
   void movdqu(XMMRegister dst, const Operand& src);