[libc-commits] [libc] [libc] Provide `LIBC_TYPES_HAS_INT64` (PR #83441)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Heads up, this broke the 32b arm build bot: https://lab.llvm.org/buildbot/#/builders/229/builds/23820

https://github.com/llvm/llvm-project/pull/83441