Use xorps to break the cvtsi2sd unnecessary dependence due to its partially written

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 8e30981833acff2e6caac0b8ddf2b0276d51c9de..ec4fe0d35d112759f8a4ae568c76faeab856fa8f 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -784,6 +784,10 @@ class MacroAssembler: public Assembler {
   void Set(Register dst, int64_t x);
   void Set(const Operand& dst, int64_t x);
 
+  // Use xorps to clear out the destination register before cvtlsi2sd
+  void Cvtlsi2sd(XMMRegister dst, Register src);
+  void Cvtlsi2sd(XMMRegister dst, const Operand& src);
+
   // Move if the registers are not identical.
   void Move(Register target, Register source);