This commit updates the test output for the updated NLL compare mode
that uses `-Z borrowck=migrate` rather than `-Z borrowck=mir`. The
previous commit changes `compiletest` and this commit only updates
`.nll.stderr` files.
* `ui/lifetimes/lifetime-errors/ex3-both-anon-regions-both-are-structs-4`
and `ex3-both-anon-regions-both-are-structs-3`
* `ui/lint/lint-group-style` and `lint-group-nonstandard-style`