No service error for using CompiledName on multiple values

Attributes are applied to each value defined in bindings. It should not be allowed for `CompiledName` and a service error should be produced.
```fsharp
[<CompiledName("A")>]
let a, b = 1, 2
```

An error is produced during IL writing:
```
Error in pass2 for type Program, error: duplicate entry 'get_A' in method table
```