[llvm] [RISCV] Correct RISCVTTIImpl::getIntImmCostInst for Zba (PR #128174)

[Craig Topper via llvm-commits]

topperc wrote:

> > The description is true but won't the AND get deleted by SelectionDAG after type legalization splits it? If the constant gets hoisted that can't happen.
> 
> Yes it should be deleted. However, this has nothing to do with the `Zba` extension. For RV32 we should return `TCC_Free`. Or?

yes we should return TCC_Free for RV32.

https://github.com/llvm/llvm-project/pull/128174