[libc][math][c23] Implement C23 math function asinpif16

[overmighty]

Part of #95250.

[llvmbot]

@llvm/issue-subscribers-libc

Author: OverMighty (overmighty)

Part of #95250.

[chios202]

Hi, I'd be interested to work on implementing this function

[overmighty]

Hi, I'd be interested to work on implementing this function

I've assigned you to it.

[tszhin-swe]

@overmighty I’m interested in working on this if it’s still open later. Thanks!

[overmighty]

@chios202 Are you still working on this?

[chios202]

I really like this task, but I'm not sure I’ll be able to finish it on time during this period. It can be reassigned if you’d like

[overmighty]

@tszhin-swe You can work on this now.