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

src/ia32/disasm-ia32.cc

Index: src/ia32/disasm-ia32.cc
diff --git a/src/ia32/disasm-ia32.cc b/src/ia32/disasm-ia32.cc
index 576c7393ccf44e87c8257dec44995a9143c45452..08ffdde5b4e7632e82d5973975c47f8ac40fd25e 100644
--- a/src/ia32/disasm-ia32.cc
+++ b/src/ia32/disasm-ia32.cc
@@ -1554,6 +1554,20 @@ int DisassemblerIA32::InstructionDecode(v8::internal::Vector<char> out_buffer,
                            NameOfXMMRegister(rm),
                            static_cast<int>(imm8));
             data += 2;
+          } else if (*data == 0x62) {
+            data++;
+            int mod, regop, rm;
+            get_modrm(*data, &mod, &regop, &rm);
+            AppendToBuffer("punpckldq %s,%s", NameOfXMMRegister(regop),
+                           NameOfXMMRegister(rm));
+            data++;
+          } else if (*data == 0x6A) {
+            data++;
+            int mod, regop, rm;
+            get_modrm(*data, &mod, &regop, &rm);
+            AppendToBuffer("punpckhdq %s,%s", NameOfXMMRegister(regop),
+                           NameOfXMMRegister(rm));
+            data++;
           } else if (*data == 0x76) {
             data++;
             int mod, regop, rm;