[llvm] [GISel][RISCV] Legalize G_CONSTANT_FOLD_BARRIER (PR #89960)

[Craig Topper via llvm-commits]

topperc wrote:

> Do you know why the `G_CONSTANT_FOLD_BARRIER` was created in the first place?

I think it is created for constants hoisted by the ConstantHoisting pass.

https://github.com/llvm/llvm-project/pull/89960