llvm-project

901862f3 - [FileCheck][NFC] Introduce Mid/Tail to -dump-input MarkerStyle (#196799)

[FileCheck][NFC] Introduce Mid/Tail to -dump-input MarkerStyle (#196799) Normally, Head is something like `^` and Mid and Tail are just `~`. However, the upcoming search range markers will have Head as `{`, Mid as ` `, and Tail as `}`. This patch separately introduces the Mid/Tail support to facilitate the review, but it is not used for anything yet here. This PR is stacked on PR #196797.