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

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

Sorry for slow response, I've been very busy lately.
I'm OK with obvious flags like mayLoad, but other needs test that show a difference in behavior. In particular (and if I remember correctly):
* isMoveReg may affect generation of DWARF debug information
* isMoveImm/isSelect are only useful if you implement corresponding TII hooks for peephole optimizer
* isAdd is unused by the generic code

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