[libc-commits] [libc] [libc][docs] add note on gcc overlay release build (PR #89314)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

AFAIK they are the same; GCC just doesn't parse the asm string to verify that the alias is defined within the same TU as it does for the alias attribute.

FWIW, we literally do the same thing a line above the one I modified.  It looks silly to me why we create 2 aliases 2 different ways to the same identifier.  Perhaps there was a reason, but I wasn't able to dig up anything via git archeology.  Looks like a mistake to me honestly.

https://github.com/llvm/llvm-project/pull/89314