[llvm-branch-commits] [libcxx] [libc++][format][3/3] Improves formatting performance. (PR #108990)

[Louis Dionne via llvm-branch-commits]

https://github.com/ldionne approved this pull request.

This LGTM once the comments have been addressed. In particular, we shouldn't need to change the transitive includes.

https://github.com/llvm/llvm-project/pull/108990