Regression with generic method overloads

The following example [compiles and runs perfectly fine](https://try.haxe.org/#0ecF1abB) on versions from 4.2.0 to 4.3.6:

```haxe
class Test {

static extern inline overload function foo>(src:S):Int {
return src.iterator().next() + 1;
}

static extern inline overload function foo>(src:S):String {
return src.iterator().next() + "!";
}

static function main() {
trace(foo([12, 34, 56]));
trace(foo(["hello", "world"]));
}
}
```

However, on the development branch, the compilation fails:
```
[ERROR] Test.hx:3: lines 3-5

3 | static extern inline overload function foo>(src:S):Int {
4 | return src.iterator().next() + 1;
5 | }
|
| Another overloaded field of same signature was already declared : foo

7 | static extern inline overload function foo>(src:S):String {
8 | return src.iterator().next() + "!";
9 | }
|
| The second field is declared here
```

Start by reproducing the provided Test.hx example on the development branch and compare it with versions 4.2.0 through 4.3.6. Investigate generic method overload handling in the compiler; done means both overloads compile and the example produces the expected results without the duplicate-signature error.

Written by the indexing model from the issue text.