[libcxx-commits] [libcxx] [libc++] Optimize `text_encoding::environment_is()` for UTF-8, ASCII, Windows1252 and ISOLatin1 (PR #225136)

[William Tran-Viet via libcxx-commits]

smallp-o-p wrote:

CC @cor3ntin as I believe this was your intention with this function from the get-go.

https://github.com/llvm/llvm-project/pull/225136