d8e55c842b
This patch exposes the internal `Sign` type for shared use by other LLVM subprojects, following the pattern established by `FPBits`. The `FPBits` utility is exposed via `libc/shared/fp_bits.h`. However, its public interface relies on the `Sign` type for, e.g., creating signed infinities and returning the sign of a value. Currently, users of the shared `FPBits` have no way to access the `Sign` type. Following the existing pattern for sharing `libc` utilities, this patch adds a new public header `libc/shared/sign.h`. This header simply includes the internal `src/__support/sign.h` and brings the `Sign` type into the `shared` namespace.
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