[llvm] [RISCV] Allow large div peephole optimization for minsize (PR #163679)

[Craig Topper via llvm-commits]

topperc wrote:

> Thanks @kvpanch and @topperc this is great.
> 
> RE: Backporting, would be nice to at least get this into LLVM 20.

LLVM 20 backports are closed. We can only backport to LLVM 21.

https://github.com/llvm/llvm-project/pull/163679