Revert of [x64] Use vcvtlsi2sd 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 68ce77e4069fe7e28247dad6e5d41af67abdd57c..551a7c16f2ed53d301a6ae0924b51fe8a0f8569c 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -1311,13 +1311,6 @@
   void vminsd(XMMRegister dst, XMMRegister src1, const Operand& src2) {
     vsd(0x5d, dst, src1, src2);
   }
-  void vcvtlsi2sd(XMMRegister dst, XMMRegister src1, Register src2) {
-    XMMRegister isrc2 = {src2.code()};
-    vsd(0x2a, dst, src1, isrc2);
-  }
-  void vcvtlsi2sd(XMMRegister dst, XMMRegister src1, const Operand& src2) {
-    vsd(0x2a, dst, src1, src2);
-  }
   void vucomisd(XMMRegister dst, XMMRegister src);
   void vucomisd(XMMRegister dst, const Operand& src);
   void vsd(byte op, XMMRegister dst, XMMRegister src1, XMMRegister src2);