[llvm] [Support] Remove redundant forwarding functions read/write (NFC) (PR #66051)

[Louis Dionne via llvm-commits]

ldionne wrote:

Honestly this would be a question for @metaflow , since the buildkite pipeline generation runs on the `service` machines, which he's in charge of.

https://github.com/llvm/llvm-project/pull/66051