[llvm] [SDAG] Add missing SoftenFloatRes legalization for FMODF (PR #129264)

[Björn Pettersson via llvm-commits]

bjope wrote:

I guess one either need to "inline" makeLibCalls in DAGTypeLegalizer::SoftenFloatRes_UnaryWithTwoFPResults making it possible to setup the ArgListTy correctly. Or maybe we should add support in MakeLibCallOptions to denote that certain arguments are pointers (and maybe also the pointer address space). 

https://github.com/llvm/llvm-project/pull/129264