[llvm] [NFC][SPARC] Add proper flags for instruction definitions (PR #182840)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

> > isMoveImm/isSelect are only useful if you implement corresponding TII hooks for peephole optimizer
> > isAdd is unused by the generic code
> 
> I do plan to do the corresponding TII hooks and use isAdd to simplify some DS filler code, should I put the flags together with the patches for them instead?

That would justify the change

https://github.com/llvm/llvm-project/pull/182840