Rollup merge of #39864 - cramertj:normalize-breaks, r=nikomatsakis

Normalize labeled and unlabeled breaks

Part of #39849.

diff --cc src/librustc/hir/lowering.rs
Simple merge

diff --cc src/librustc_resolve/lib.rs
Simple merge

diff --cc src/librustc_typeck/check/mod.rs
Simple merge