[llvm] [RISCV] Copy call frame size when splitting basic block in emitSelectPseudo. (PR #99823)

[Alex Bradbury via llvm-commits]

asb wrote:

> > I'll note the underlying scheme seems very fragile. This may not be the only case like this we need to identify.
> 
> We have several other places in the same file where we manually create MI control flow. Don't we need to update every one of those?

I'm also wondering this - is there any reference on when this is necessary?

Broader questions aside, change LGTM.

https://github.com/llvm/llvm-project/pull/99823