[libc-commits] [libc] [libc] fix clang-tidy llvm-header-guard warnings (PR #82679)

[Michael Jones via libc-commits]

michaelrj-google wrote:

By "macro namespacing" I mean ensuring all our publicly available macros start (and possibly end) with a specific prefix. Looking at it, it's probably fine for that prefix to just be `LLVM_LIBC_` since it's unlikely to have any collisions.

https://github.com/llvm/llvm-project/pull/82679