[x64] Emit vcvtss2sd & vcvtsd2ss when AVX is enabled.

src/x64/disasm-x64.cc

Index: src/x64/disasm-x64.cc
diff --git a/src/x64/disasm-x64.cc b/src/x64/disasm-x64.cc
index 798f4d94c745bd8eca1124cc2ebb1dc58eb451cb..3569dbf6eb943984f88b71a7f05bb356540fce9c 100644
--- a/src/x64/disasm-x64.cc
+++ b/src/x64/disasm-x64.cc
@@ -966,6 +966,11 @@ int DisassemblerX64::AVXInstruction(byte* data) {
                        NameOfXMMRegister(vvvv));
         current += PrintRightXMMOperand(current);
         break;
+      case 0x5a:
+        AppendToBuffer("vcvtss2sd %s,%s,", NameOfXMMRegister(regop),
+                       NameOfXMMRegister(vvvv));
+        current += PrintRightXMMOperand(current);
+        break;
       case 0x5c:
         AppendToBuffer("vsubss %s,%s,", NameOfXMMRegister(regop),
                        NameOfXMMRegister(vvvv));
@@ -1022,6 +1027,11 @@ int DisassemblerX64::AVXInstruction(byte* data) {
                        NameOfXMMRegister(vvvv));
         current += PrintRightXMMOperand(current);
         break;
+      case 0x5a:
+        AppendToBuffer("vcvtsd2ss %s,%s,", NameOfXMMRegister(regop),
+                       NameOfXMMRegister(vvvv));
+        current += PrintRightXMMOperand(current);
+        break;
       case 0x5c:
         AppendToBuffer("vsubsd %s,%s,", NameOfXMMRegister(regop),
                        NameOfXMMRegister(vvvv));