[llvm] [RISCV] Stash GPR to FPR if emergency spill slot is not reachable (PR #180685)

[via llvm-commits]

LukeZhuang wrote:

> > > Thanks guys for the explanation, I think I get the rough image of the proposal now. The key idea is force using frame pointer when call frame is too large, which allow us to access spilled stuff from the other direction instead of the bottom of the area indicated by sp.
> > 
> > 
> > As I was already working on a fix for #180199 I should be to fix this issue too. It's the same.
> 
> Great! May I ask if it’s okay that I add these two test cases in this patch to the test-suite then?

@topperc https://github.com/llvm/llvm-project/pull/181537

https://github.com/llvm/llvm-project/pull/180685