[llvm] [RISCV] Update the canonical extension order (PR #192392)

[Craig Topper via llvm-commits]

topperc wrote:

> This needs:
> 
> * A release note
> * If errors are given about the order (I recall they are), tests showing there are not errors for the new order, and are errors for the old order.

I don't think the parser gives any errors these days. This may only affected the output order when we print the ISA string.

https://github.com/llvm/llvm-project/pull/192392