[libc-commits] [libc] [libc] reland mincore (PR #79309)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Looks like the test is failing on aarch64. PTAL

https://lab.llvm.org/buildbot/#/builders/138/builds/59141/steps/7/logs/stdio

https://github.com/llvm/llvm-project/pull/79309