[llvm] RuntimeLibcalls: Describe register-returning divmod libcall ABIs (PR #217825)

[Peter Smith via llvm-commits]

https://github.com/smithp35 commented:

This looks fine to me on the Arm ABI front (based on https://github.com/ARM-software/abi-aa/blob/main/rtabi32/rtabi32.rst#531integer-3232--32-division-functions).

Will need someone to confirm the Windows side.

https://github.com/llvm/llvm-project/pull/217825