[libc-commits] [libc] [libc][stdfix] Implement fixed point bitsfx functions in llvm-libc (PR #116599)

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overmighty wrote:

We seemingly don't have an explicit template instantiation of `testing::internal::test` for `signed char`: https://github.com/llvm/llvm-project/blob/b8eef18868570b2f5244d6d43de02a1812d1c880/libc/test/UnitTest/LibcTest.cpp#L220.

https://github.com/llvm/llvm-project/pull/116599