X86: Implement MOVDQ2Q.

src/arch/x86/isa/decoder/two_byte_opcodes.isa

@@ -968,7 +968,7 @@
                     // repne (0xF2)
                     0x8: decode OPCODE_OP_BOTTOM3 {
                         0x0: WarnUnimpl::addsubps_Vo_Wo();
-                        0x6: WarnUnimpl::movdq2q_Pq_VRq();
+                        0x6: MOVDQ2Q(Pq,VRq);
                         default: UD2();
                     }
                     default: UD2();

src/arch/x86/isa/insts/simd128/integer/data_transfer/move.py

@@ -78,9 +78,12 @@ def macroop MOVQ_P_XMM {
     rdip t7
     stfp xmml, seg, riprel, disp, dataSize=8
 };
+
+def macroop MOVDQ2Q_MMX_XMM {
+    movfp mmx, xmmlm, dataSize=8
+};
 '''
 # MOVDQA
 # MOVDQU
-# MOVDQ2Q
 # MOVQ2DQ
 # LDDQU