Implemented return values

src/build/arch/x64/Registers.go

@@ -22,7 +22,7 @@ const (
 )
 
 var (
-	CallRegisters        = []cpu.Register{RDI, RSI, RDX, RCX, R8, R9}
+	CallRegisters        = SyscallRegisters
 	GeneralRegisters     = []cpu.Register{RBX, RBP, R12, R13, R14, R15}
 	SyscallRegisters     = []cpu.Register{RAX, RDI, RSI, RDX, R10, R8, R9}
 	ReturnValueRegisters = []cpu.Register{RAX, RCX, R11}