[llvm] IPRA: Fixes an IPRA compilation failure. (PR #196928)

[Quentin Colombet via llvm-commits]

https://github.com/qcolombet requested changes to this pull request.

I feel we're kind of abusing `getIntraCallClobberedRegs` but ultimately I can live with it assuming this would be the right solution.

So now is this the right solution? I'm not sure.
The point of the IPRA is to essentially produce custom ABIs. If we have to conform to the ABI then there's no point in running IPRA since any changes in the clobbered list is technically a violation of the related ABI.

TL;DR can we fix the Stackifier instead?

https://github.com/llvm/llvm-project/pull/196928