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

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lntue wrote:

> * Tests involving `__m128i`, `__m256i`, and `__m512i` in `test.src.string.memory_utils.op_tests.cpp`

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.  But I think it's ok to create an issue to re-enable these optimizations later.

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