[llvm] [mlir] [TableGen] Split *GenRegisterInfo.inc. (PR #167700)

[Ivan Kosarev via llvm-commits]

kosarev wrote:

> > Worst case, it just won't build. We'll know if that's a practical problem.
> 
> That does seem like an issue for robustness.

Will look into it. I understand there is a way to specify multiple outputs with CMake.


> It also occurred to me... if we don't overwrite the main .inc file because it doesn't change, do we end up re-running TableGen all the time now?

Why 'now'? This patch doesn't change anything in this regard.

>From what I see, where possible we ask TableGen to --write-if-changed and then instruct Ninja to restat.

https://github.com/llvm/llvm-project/pull/167700