Getter + increment haxe.Int64 variable compile error

Recently, the following example does not compile, with message "haxe.Int64 should be Int". However, we should be able to increment an `haxe.Int64` value. Without getter or without increment, the code compile correctly.
```haxe
static var uid(get,default) : haxe.Int64;
static var __uid : haxe.Int64 = 0;
static inline function get_uid():haxe.Int64 return __uid;
static var uid2 : haxe.Int64 = 0;

static public function main() {
uid++; // Error "haxe.Int64 should be Int"
uid += 1; // Ok
uid2++; // Ok
}
```

The first bad commit is https://github.com/HaxeFoundation/haxe/commit/a57c74c770e986f6bbd40c350af6e1bae65abf0b which is also related to the issue about setter and increment https://github.com/HaxeFoundation/haxe/issues/11577

Start with the provided Haxe reproduction and inspect the first bad commit a57c74c770e986f6bbd40c350af6e1bae65abf0b. Compare the getter-backed `uid++` case with `uid += 1` and `uid2++`, then review related issue #11577. Done means the example compiles without the `haxe.Int64 should be Int` error.

Written by the indexing model from the issue text.