Add guard support for replace_if_let_with_match

Example
---
```rust
fn main() {
    if $0let true = true
        && true
        && false
    {
        code()
    }
}
```
```rust
fn main() {
    match true {
        true if true
            && false => code(),
        _ => (),
    }
}
```

Author: A4-Tacks