For loop with negative step: false positive

还没有人认领这个 Issue。

### How are you using the lua-language-server?

NeoVim

### Which OS are you using?

Windows WSL

### What is the issue affecting?

Diagnostics/Syntax Checking

### Expected Behaviour

Warning shouldn't be displayed

### Actual Behaviour

Warning is displayed

### Reproduction steps

```lua
local r = 1
for x = -r, 1 do
print(x)
end
```

### Additional Notes

Tested on 3.13.2.

### Log File

I am using nvim + mason, and it does not save any logs even with command line arguments.

在报告的 Neovim 设置中通过 LuaLS 3.13.2 运行提供的 Lua 代码片段，并确认 Diagnostics/Syntax Checking 下的诊断结果。跟踪数值 for 循环的分析方式，然后验证这个有效的循环不再产生警告。

由索引模型根据 Issue 内容生成。