[x64] Emit vmovmskpd when AVX is enabled.

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index 9af5421ebadc05023ef68e850f5c34891bde95a5..499ac32a56cea836f16bf930d76fe2b4ab3e9b8f 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -1281,7 +1281,6 @@ class Assembler : public AssemblerBase {
   void vmovq(XMMRegister dst, const Operand& src);
   void vmovq(Register dst, XMMRegister src);
 
-  void vmovapd(XMMRegister dst, XMMRegister src);
   void vmovsd(XMMRegister dst, const Operand& src) {
     vsd(0x10, dst, xmm0, src);
   }
@@ -1584,6 +1583,12 @@ class Assembler : public AssemblerBase {
   void rorxl(Register dst, Register src, byte imm8);
   void rorxl(Register dst, const Operand& src, byte imm8);
 
+  void vmovapd(XMMRegister dst, XMMRegister src) { vpd(0x28, dst, xmm0, src); }
+  void vmovmskpd(Register dst, XMMRegister src) {
+    XMMRegister idst = {dst.code()};
+    vpd(0x50, idst, xmm0, src);
+  }
+
 #define PACKED_OP_LIST(V) \
   V(and, 0x54)            \
   V(xor, 0x57)