[libc-commits] [libc] [libc][NFC] Rename SPECIAL_X86_LONG_DOUBLE in LIBC_LONG_DOUBLE_IS_X86_BIN80 (PR #73950)

[Guillaume Chatelet via libc-commits]

gchatelet wrote:

Same as https://github.com/llvm/llvm-project/pull/73948, let me know if you have a better name suggestion.

https://github.com/llvm/llvm-project/pull/73950