Auto merge of rust-lang#10222 - Alexendoo:needless-lifetime-suggestion, r=flip1995

Add machine applicable suggestion for `needless_lifetimes`

changelog: [`needless_lifetimes`]: Add machine applicable suggestion

Fixes rust-lang#9360

It doesn't make suggestions for async functions as the input lifetime spans are funky there

The examples in rust-lang#5787 and rust-lang#7271 no longer seem to FP this PR aside, I added tests for them rather than disabling the lint entirely for async functions, I don't know if there are further FPs there though

Closes rust-lang#5787
Closes rust-lang#7271

Author: bors