[llvm] [GISel][RISCV]Implement indirect parameter passing for large scalars (PR #95429)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

Could you change in the summary:
 Currently I put the code in TargetLowering::handleAssignments and I think it is general enough for all the targets to
to 
 Currently I put the code in CallLowering::handleAssignments and I think it is general enough for all the targets to



https://github.com/llvm/llvm-project/pull/95429