[llvm] [RISCV][MC] Pass MCSubtargetInfo down to shouldForceRelocation and evaluateTargetFixup. (PR #73721)

[Matt Arsenault via llvm-commits]

arsenm wrote:

We do have a number of features that really shouldn't have been subtarget features in the first place in different targets. Should the feature in question be moved to something in the TargetMachine?

https://github.com/llvm/llvm-project/pull/73721