[llvm] [RISC-V] Use an optional offset operand instead of zero-offset InstAliases (PR #210901)

[Craig Topper via llvm-commits]

topperc wrote:

> > > lw a0, -2049(f0)
> > 
> > 
> > Looks like this one also doesn't change. I added your test in #214070, but it does not change.
> 
> Hmmm. I thought it wouldn't be possible to get `note: expected '('` after your change.

I guess its coming from the aliases still in RISCVInstrInfoXqci.td

https://github.com/llvm/llvm-project/pull/210901