[libc-commits] [libc] [libc] Fix incorrect unsigned comparison (PR #135595)

[Wu Yingcong via libc-commits]

yingcong-wu wrote:

The build error looks not related to my change.
```
/home/runner/work/llvm-project/llvm-project/build/compiler-rt/lib/fuzzer/libcxx_fuzzer_aarch64/build/include/c++/v1/__bit/popcount.h:30:10: error: use of undeclared identifier '__builtin_popcountg'
   30 |   return __builtin_popcountg(__t);
```

https://github.com/llvm/llvm-project/pull/135595