[libc-commits] [libc] [libc][math][c23] Add acospif16() function (PR #134664)

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lntue wrote:

> @lntue - I think this time I did not miss anything - triple checked the files I committed and everything seems to be in order. It says for some reason that acospi is undeclared in MPFR - I guess it is what @overmighty in the previous PR I created?
> 
> ```
> FAILED: projects/libc/utils/MPFRWrapper/CMakeFiles/libcMPCommon.dir/MPCommon.cpp.o 
> 
> /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-clshd-1/llvm-project/github-pull-requests/libc/utils/MPFRWrapper/MPCommon.cpp:69:3:  error:  use of undeclared identifier 'mpfr_acospi' 
> ```

It is because the MPFR version in the build bot machine is older than the latest MPFR, so `mpfr_acospi` is not available.  You will need to add some work around similar to https://github.com/llvm/llvm-project/blob/main/libc/utils/MPFRWrapper/MPCommon.cpp#L393


https://github.com/llvm/llvm-project/pull/134664