Auto merge of #11413 - jonboh:master, r=Alexendoo

new unnecessary_map_on_constructor lint

changelog: [`unnecessary_map_on_constructor`]: adds lint for cases in which map is not necessary. `Some(4).map(myfunction)` => `Some(myfunction(4))`

Closes https://github.com/rust-lang/rust-clippy/issues/6472

Note that the case mentioned in the issue `Some(..).and_then(|..| Some(..))` is fixed by a chain of lint changes. This PR completes the last part of that chain.

By `bind_instead_of_map`[lint](https://rust-lang.github.io/rust-clippy/master/index.html#/bind_instead_of_map):
`Some(4).and_then(|x| Some(foo(4)))` => `Some(4).map(|x| foo)`

By `redundant_closure` [lint](https://rust-lang.github.io/rust-clippy/master/index.html#/redundant_closure):
`Some(4).map(|x| foo)` => `Some(4).map(fun)`

Finally by this PR `unnecessary_map_on_constructor`:
`Some(4).map(fun)` => `Some(fun(4))`

I'm not sure this is the desired behavior for clippy and if it should be addressed in another issue/PR. I'd be up to give it a try if that's the case.

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