[llvm] [RISCV][GISEL] Legalization, register bank selection, and instruction selection for scalable G_SELECT (PR #85540)

[Michael Maitland via llvm-commits]

michaelmaitland wrote:

> > and an ISD::VSELECT when the condition is scalar.
> 
> That seems wrong. An ISD::VSELECT has vector condition not scalar condition.

Revised

https://github.com/llvm/llvm-project/pull/85540