Merge `interface::run_compiler` calls.

`rustc_driver_impl::run_compiler` currently has two
`interface::run_compiler` calls: one for the "no input" case, and one
for the normal case.

This commit merges the former into the latter, which makes the control
flow easier to read and avoids some duplication.

It also makes it clearer that the "no input" case will describe lints
before printing crate info, while the normal case does it in the reverse
order. Possibly a bug?

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