Bug in obfuscate js code.

First at all, sorry for my english, i will try to explain it as better as possible.

I have the following js code:

```javascript
export const Painter = function (elements, data) {
let title = elements.title;
let container = elements.container;
this.prePaint = () => { };
this.paint = () => { };
this.postPaint = () => { };
let finalPaint = () => {
this.prePaint = () => { };
this.paint = () => { };
this.postPaint = () => { };
createPromise();
};

let createPromise = () => {
return new Promise((resolve, reject) => {
this.paint = () => { resolve() }
}).then(() => {
this.prePaint(elements, data);
title.innerHTML = data.title;
container.innerHTML = data.html;
this.postPaint(elements, data);
finalPaint();
});
}

createPromise();
};
```

When i obfuscate this code, it seems like this (it was minimized and formatted by the browser):
```javascript
5: [function(a, b, c) {
"use strict";
Object[_0x56ae("0x6")](c, _0x56ae("0x6e"), {
value: !0
});
c[_0x56ae("0xb5")] = function(a, b) {
var c = this
, d = a[_0x56ae("0xb6")]
, e = a[_0x56ae("0xb7")];
this.prePaint = function() {} //// THIS LINE
,
this[_0x56ae("0xb8")] = function() {}
,
this[_0x56ae("0xb9")] = function() {}
;
var f = function() {
c[_0x56ae("0xba")] = function() {}
,
c.paint = function() {} ///// THIS LINE TOO
,
c.postPaint = function() {} ///// AND THIS LINE TOO
,
g()
}
, g = function() {
return new Promise(function(a) {
c.paint = function() {
a()
}
}
)[_0x56ae("0x24")](function() {
c[_0x56ae("0xba")](a, b),
d.innerHTML = b[_0x56ae("0xb6")],
e.innerHTML = b[_0x56ae("0x34")],
c.postPaint(a, b),
f()
})
};
g()
}
}
, {}]
```

You can see, how the fisrt this.prePaint has not transformed to this[_0x56ae("0xba")] and when this is called, it said undefined function.
But if i insert breaklines between all this "problematic" lines, it work. Like this:

```javascript

export const Painter = function (elements, data) {
let title = elements.title;
let container = elements.container;

this.prePaint = () => { };

this.paint = () => { };

this.postPaint = () => { };

let finalPaint = () => {

this.prePaint = () => { };

this.paint = () => { };

this.postPaint = () => { };

createPromise();
};

let createPromise = () => {
return new Promise((resolve, reject) => {

this.paint = () => { resolve() }

}).then(() => {
this.prePaint(elements, data);

title.innerHTML = data.title;
container.innerHTML = data.html;

this.postPaint(elements, data);

finalPaint();

});
}

createPromise();
};
```

I did fix this issue with this partial solution, but i don't know where more places of my code, will appear the same issue.

Thank you

Nenhum arquivo do repositório, teste, versão ou configuração é especificado. Comece reproduzindo o exemplo Painter fornecido por meio do pipeline de ofuscação do gulp e compare as referências geradas para this.prePaint, this.paint e this.postPaint. Está concluído quando o código ofuscado preserva referências de propriedades chamáveis sem exigir quebras de linha inseridas.

Escrita pelo modelo de indexação a partir do texto da issue.