ASSERTION Failure: "reg < this->GetConstantCount()" in ChakraCore/lib/Runtime/./Base/FunctionBody.h, line 2977

### commit
41ad58a9eebf8d52a83424c8fccfaacdb14105ec

### Build platform
Ubuntu 20.04

### Build steps

```
./build.sh --debug
```

### poc

```js
function foo() {
(function () {
function bar(
a = 1,
b = function () {
return a;
}
)
{
var arguments = 3;
}
}());
}

WScript.Attach(foo);
```

### assert log

```
ASSERTION 2397793: (ChakraCore/lib/Runtime/./Base/FunctionBody.h, line 2977) reg < this->GetConstantCount()
Failure: (reg < this->GetConstantCount())
Illegal instruction
```