[libc-commits] [libc] [libc] Add osutils for Windows and make libc and its tests build on Windows target (PR #104676)

[Sirui Mu via libc-commits]

Lancern wrote:

> hmmm, are memcpy/memset routines actually failing? that sounds concerning.

> What errors did you get for these? One possibility is that we will need to include <x86_intrin.h>, and pass proper compiler flags /arch:AVX, /arch:AVX2, /arch:AVX512 for Windows.

The problem with the memcpy / memset / __m128i / __m256i / __m512i tests are still not fully investigated. I'll investigate further into them later. Resolving these problems in this PR may make this PR hard to review so I does not resolve them for now.

https://github.com/llvm/llvm-project/pull/104676