FS2014 when using tupled args

#### Repro

```fs
module Thing
let error =
let f _ _ _ (stateA, resultA) (stateB, resultB) _ =
if stateA && stateB then resultA else resultB
f () () () (true, ()) (true, ()) ()
```

Zip file with the repro case:
[FS2014.zip](https://github.com/Microsoft/visualfsharp/files/3003135/FS2014.zip)

#### Expected behavior

Compiles without problem.

#### Actual behavior
```
Severity Code Description Project File Line Suppression State
Error FS2014 A problem occurred writing the binary 'C:\Users\Admin\source\repos\FS2014\FS2014\obj\Debug\netcoreapp2.1\FS2014.dll': Error in pass2 for type Thing, error: Error in pass2 for type f@3TTTTTD, error: duplicate entry 'tupledArg' in field table FS2014 C:\Users\Admin\source\repos\FS2014\FS2014\FSC 1 Active
```

#### Known workarounds

Modify f, e.g. removing arguments, replacing function body

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